Adding upstream version 1:0.1.9998svn3589+dfsg.upstream/1%0.1.9998svn3589+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 8759 insertions, 0 deletions

diff --git a/src/grep/doc/Makefile.am b/src/grep/doc/Makefile.am
new file mode 100644
index 0000000..7075e8d
--- /dev/null
+++ b/src/grep/doc/Makefile.am
@@ -0,0 +1,38 @@
+# Process this file with automake to create Makefile.in
+# Makefile.am for grep/doc.
+#
+# Copyright 2008-2021 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+info_TEXINFOS = grep.texi
+grep_TEXINFOS = fdl.texi
+
+man_MANS = grep.1 fgrep.1 egrep.1
+
+EXTRA_DIST = grep.in.1
+CLEANFILES = grep.1 egrep.1 fgrep.1
+
+grep.1: grep.in.1
+	$(AM_V_GEN)rm -f $@-t $@
+	$(AM_V_at)sed 's/@''VERSION@/$(VERSION)/' $(srcdir)/grep.in.1 > $@-t
+	$(AM_V_at)chmod a=r $@-t
+	$(AM_V_at)mv -f $@-t $@
+
+egrep.1 fgrep.1: Makefile.am
+	$(AM_V_GEN)rm -f $@-t $@
+	$(AM_V_at)inst=`echo grep | sed '$(transform)'`.1 \
+	  && echo ".so man1/$$inst" > $@-t
+	$(AM_V_at)chmod a=r $@-t
+	$(AM_V_at)mv -f $@-t $@
diff --git a/src/grep/doc/Makefile.in b/src/grep/doc/Makefile.in
new file mode 100644
index 0000000..24fe731
--- /dev/null
+++ b/src/grep/doc/Makefile.in
@@ -0,0 +1,2130 @@
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+
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+
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+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
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+  for p in $$list; do echo "$$p $$p"; done | \
+  sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \
+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
+    if (++n[$$2] == $(am__install_max)) \
+      { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \
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+  sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \
+  sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
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+  test -z "$$files" \
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+    || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
+         $(am__cd) "$$dir" && rm -f $$files; }; \
+  }
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+am__DIST_COMMON = $(grep_TEXINFOS) $(srcdir)/Makefile.in \
+	$(top_srcdir)/build-aux/mdate-sh \
+	$(top_srcdir)/build-aux/texinfo.tex
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
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+GL_GNULIB_ACCEPT4 = @GL_GNULIB_ACCEPT4@
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+GL_GNULIB_ALIGNED_ALLOC = @GL_GNULIB_ALIGNED_ALLOC@
+GL_GNULIB_ALPHASORT = @GL_GNULIB_ALPHASORT@
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+GL_GNULIB_BIND = @GL_GNULIB_BIND@
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+GL_GNULIB_CALLOC_POSIX = @GL_GNULIB_CALLOC_POSIX@
+GL_GNULIB_CANONICALIZE_FILE_NAME = @GL_GNULIB_CANONICALIZE_FILE_NAME@
+GL_GNULIB_CHDIR = @GL_GNULIB_CHDIR@
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+GL_GNULIB_CLOSEDIR = @GL_GNULIB_CLOSEDIR@
+GL_GNULIB_CONNECT = @GL_GNULIB_CONNECT@
+GL_GNULIB_COPY_FILE_RANGE = @GL_GNULIB_COPY_FILE_RANGE@
+GL_GNULIB_CREAT = @GL_GNULIB_CREAT@
+GL_GNULIB_CTIME = @GL_GNULIB_CTIME@
+GL_GNULIB_DIRFD = @GL_GNULIB_DIRFD@
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+GL_GNULIB_DUPLOCALE = @GL_GNULIB_DUPLOCALE@
+GL_GNULIB_ENVIRON = @GL_GNULIB_ENVIRON@
+GL_GNULIB_EUIDACCESS = @GL_GNULIB_EUIDACCESS@
+GL_GNULIB_EXECL = @GL_GNULIB_EXECL@
+GL_GNULIB_EXECLE = @GL_GNULIB_EXECLE@
+GL_GNULIB_EXECLP = @GL_GNULIB_EXECLP@
+GL_GNULIB_EXECV = @GL_GNULIB_EXECV@
+GL_GNULIB_EXECVE = @GL_GNULIB_EXECVE@
+GL_GNULIB_EXECVP = @GL_GNULIB_EXECVP@
+GL_GNULIB_EXECVPE = @GL_GNULIB_EXECVPE@
+GL_GNULIB_EXPLICIT_BZERO = @GL_GNULIB_EXPLICIT_BZERO@
+GL_GNULIB_FACCESSAT = @GL_GNULIB_FACCESSAT@
+GL_GNULIB_FCHDIR = @GL_GNULIB_FCHDIR@
+GL_GNULIB_FCHMODAT = @GL_GNULIB_FCHMODAT@
+GL_GNULIB_FCHOWNAT = @GL_GNULIB_FCHOWNAT@
+GL_GNULIB_FCLOSE = @GL_GNULIB_FCLOSE@
+GL_GNULIB_FCNTL = @GL_GNULIB_FCNTL@
+GL_GNULIB_FDATASYNC = @GL_GNULIB_FDATASYNC@
+GL_GNULIB_FDOPEN = @GL_GNULIB_FDOPEN@
+GL_GNULIB_FDOPENDIR = @GL_GNULIB_FDOPENDIR@
+GL_GNULIB_FFLUSH = @GL_GNULIB_FFLUSH@
+GL_GNULIB_FFSL = @GL_GNULIB_FFSL@
+GL_GNULIB_FFSLL = @GL_GNULIB_FFSLL@
+GL_GNULIB_FGETC = @GL_GNULIB_FGETC@
+GL_GNULIB_FGETS = @GL_GNULIB_FGETS@
+GL_GNULIB_FNMATCH = @GL_GNULIB_FNMATCH@
+GL_GNULIB_FOPEN = @GL_GNULIB_FOPEN@
+GL_GNULIB_FPRINTF = @GL_GNULIB_FPRINTF@
+GL_GNULIB_FPRINTF_POSIX = @GL_GNULIB_FPRINTF_POSIX@
+GL_GNULIB_FPURGE = @GL_GNULIB_FPURGE@
+GL_GNULIB_FPUTC = @GL_GNULIB_FPUTC@
+GL_GNULIB_FPUTS = @GL_GNULIB_FPUTS@
+GL_GNULIB_FREAD = @GL_GNULIB_FREAD@
+GL_GNULIB_FREE_POSIX = @GL_GNULIB_FREE_POSIX@
+GL_GNULIB_FREOPEN = @GL_GNULIB_FREOPEN@
+GL_GNULIB_FSCANF = @GL_GNULIB_FSCANF@
+GL_GNULIB_FSEEK = @GL_GNULIB_FSEEK@
+GL_GNULIB_FSEEKO = @GL_GNULIB_FSEEKO@
+GL_GNULIB_FSTAT = @GL_GNULIB_FSTAT@
+GL_GNULIB_FSTATAT = @GL_GNULIB_FSTATAT@
+GL_GNULIB_FSYNC = @GL_GNULIB_FSYNC@
+GL_GNULIB_FTELL = @GL_GNULIB_FTELL@
+GL_GNULIB_FTELLO = @GL_GNULIB_FTELLO@
+GL_GNULIB_FTRUNCATE = @GL_GNULIB_FTRUNCATE@
+GL_GNULIB_FUTIMENS = @GL_GNULIB_FUTIMENS@
+GL_GNULIB_FWRITE = @GL_GNULIB_FWRITE@
+GL_GNULIB_GETC = @GL_GNULIB_GETC@
+GL_GNULIB_GETCHAR = @GL_GNULIB_GETCHAR@
+GL_GNULIB_GETCWD = @GL_GNULIB_GETCWD@
+GL_GNULIB_GETDELIM = @GL_GNULIB_GETDELIM@
+GL_GNULIB_GETDOMAINNAME = @GL_GNULIB_GETDOMAINNAME@
+GL_GNULIB_GETDTABLESIZE = @GL_GNULIB_GETDTABLESIZE@
+GL_GNULIB_GETENTROPY = @GL_GNULIB_GETENTROPY@
+GL_GNULIB_GETGROUPS = @GL_GNULIB_GETGROUPS@
+GL_GNULIB_GETHOSTNAME = @GL_GNULIB_GETHOSTNAME@
+GL_GNULIB_GETLINE = @GL_GNULIB_GETLINE@
+GL_GNULIB_GETLOADAVG = @GL_GNULIB_GETLOADAVG@
+GL_GNULIB_GETLOGIN = @GL_GNULIB_GETLOGIN@
+GL_GNULIB_GETLOGIN_R = @GL_GNULIB_GETLOGIN_R@
+GL_GNULIB_GETOPT_POSIX = @GL_GNULIB_GETOPT_POSIX@
+GL_GNULIB_GETPAGESIZE = @GL_GNULIB_GETPAGESIZE@
+GL_GNULIB_GETPASS = @GL_GNULIB_GETPASS@
+GL_GNULIB_GETPEERNAME = @GL_GNULIB_GETPEERNAME@
+GL_GNULIB_GETSOCKNAME = @GL_GNULIB_GETSOCKNAME@
+GL_GNULIB_GETSOCKOPT = @GL_GNULIB_GETSOCKOPT@
+GL_GNULIB_GETSUBOPT = @GL_GNULIB_GETSUBOPT@
+GL_GNULIB_GETTIMEOFDAY = @GL_GNULIB_GETTIMEOFDAY@
+GL_GNULIB_GETUMASK = @GL_GNULIB_GETUMASK@
+GL_GNULIB_GETUSERSHELL = @GL_GNULIB_GETUSERSHELL@
+GL_GNULIB_GRANTPT = @GL_GNULIB_GRANTPT@
+GL_GNULIB_GROUP_MEMBER = @GL_GNULIB_GROUP_MEMBER@
+GL_GNULIB_ICONV = @GL_GNULIB_ICONV@
+GL_GNULIB_IMAXABS = @GL_GNULIB_IMAXABS@
+GL_GNULIB_IMAXDIV = @GL_GNULIB_IMAXDIV@
+GL_GNULIB_INET_NTOP = @GL_GNULIB_INET_NTOP@
+GL_GNULIB_INET_PTON = @GL_GNULIB_INET_PTON@
+GL_GNULIB_IOCTL = @GL_GNULIB_IOCTL@
+GL_GNULIB_ISATTY = @GL_GNULIB_ISATTY@
+GL_GNULIB_ISBLANK = @GL_GNULIB_ISBLANK@
+GL_GNULIB_ISWBLANK = @GL_GNULIB_ISWBLANK@
+GL_GNULIB_ISWCTYPE = @GL_GNULIB_ISWCTYPE@
+GL_GNULIB_ISWDIGIT = @GL_GNULIB_ISWDIGIT@
+GL_GNULIB_ISWXDIGIT = @GL_GNULIB_ISWXDIGIT@
+GL_GNULIB_LCHMOD = @GL_GNULIB_LCHMOD@
+GL_GNULIB_LCHOWN = @GL_GNULIB_LCHOWN@
+GL_GNULIB_LINK = @GL_GNULIB_LINK@
+GL_GNULIB_LINKAT = @GL_GNULIB_LINKAT@
+GL_GNULIB_LISTEN = @GL_GNULIB_LISTEN@
+GL_GNULIB_LOCALECONV = @GL_GNULIB_LOCALECONV@
+GL_GNULIB_LOCALENAME = @GL_GNULIB_LOCALENAME@
+GL_GNULIB_LOCALTIME = @GL_GNULIB_LOCALTIME@
+GL_GNULIB_LSEEK = @GL_GNULIB_LSEEK@
+GL_GNULIB_LSTAT = @GL_GNULIB_LSTAT@
+GL_GNULIB_MALLOC_POSIX = @GL_GNULIB_MALLOC_POSIX@
+GL_GNULIB_MBRLEN = @GL_GNULIB_MBRLEN@
+GL_GNULIB_MBRTOWC = @GL_GNULIB_MBRTOWC@
+GL_GNULIB_MBSCASECMP = @GL_GNULIB_MBSCASECMP@
+GL_GNULIB_MBSCASESTR = @GL_GNULIB_MBSCASESTR@
+GL_GNULIB_MBSCHR = @GL_GNULIB_MBSCHR@
+GL_GNULIB_MBSCSPN = @GL_GNULIB_MBSCSPN@
+GL_GNULIB_MBSINIT = @GL_GNULIB_MBSINIT@
+GL_GNULIB_MBSLEN = @GL_GNULIB_MBSLEN@
+GL_GNULIB_MBSNCASECMP = @GL_GNULIB_MBSNCASECMP@
+GL_GNULIB_MBSNLEN = @GL_GNULIB_MBSNLEN@
+GL_GNULIB_MBSNRTOWCS = @GL_GNULIB_MBSNRTOWCS@
+GL_GNULIB_MBSPBRK = @GL_GNULIB_MBSPBRK@
+GL_GNULIB_MBSPCASECMP = @GL_GNULIB_MBSPCASECMP@
+GL_GNULIB_MBSRCHR = @GL_GNULIB_MBSRCHR@
+GL_GNULIB_MBSRTOWCS = @GL_GNULIB_MBSRTOWCS@
+GL_GNULIB_MBSSEP = @GL_GNULIB_MBSSEP@
+GL_GNULIB_MBSSPN = @GL_GNULIB_MBSSPN@
+GL_GNULIB_MBSSTR = @GL_GNULIB_MBSSTR@
+GL_GNULIB_MBSTOK_R = @GL_GNULIB_MBSTOK_R@
+GL_GNULIB_MBTOWC = @GL_GNULIB_MBTOWC@
+GL_GNULIB_MDA_ACCESS = @GL_GNULIB_MDA_ACCESS@
+GL_GNULIB_MDA_CHDIR = @GL_GNULIB_MDA_CHDIR@
+GL_GNULIB_MDA_CHMOD = @GL_GNULIB_MDA_CHMOD@
+GL_GNULIB_MDA_CLOSE = @GL_GNULIB_MDA_CLOSE@
+GL_GNULIB_MDA_CREAT = @GL_GNULIB_MDA_CREAT@
+GL_GNULIB_MDA_DUP = @GL_GNULIB_MDA_DUP@
+GL_GNULIB_MDA_DUP2 = @GL_GNULIB_MDA_DUP2@
+GL_GNULIB_MDA_ECVT = @GL_GNULIB_MDA_ECVT@
+GL_GNULIB_MDA_EXECL = @GL_GNULIB_MDA_EXECL@
+GL_GNULIB_MDA_EXECLE = @GL_GNULIB_MDA_EXECLE@
+GL_GNULIB_MDA_EXECLP = @GL_GNULIB_MDA_EXECLP@
+GL_GNULIB_MDA_EXECV = @GL_GNULIB_MDA_EXECV@
+GL_GNULIB_MDA_EXECVE = @GL_GNULIB_MDA_EXECVE@
+GL_GNULIB_MDA_EXECVP = @GL_GNULIB_MDA_EXECVP@
+GL_GNULIB_MDA_EXECVPE = @GL_GNULIB_MDA_EXECVPE@
+GL_GNULIB_MDA_FCLOSEALL = @GL_GNULIB_MDA_FCLOSEALL@
+GL_GNULIB_MDA_FCVT = @GL_GNULIB_MDA_FCVT@
+GL_GNULIB_MDA_FDOPEN = @GL_GNULIB_MDA_FDOPEN@
+GL_GNULIB_MDA_FILENO = @GL_GNULIB_MDA_FILENO@
+GL_GNULIB_MDA_GCVT = @GL_GNULIB_MDA_GCVT@
+GL_GNULIB_MDA_GETCWD = @GL_GNULIB_MDA_GETCWD@
+GL_GNULIB_MDA_GETPID = @GL_GNULIB_MDA_GETPID@
+GL_GNULIB_MDA_GETW = @GL_GNULIB_MDA_GETW@
+GL_GNULIB_MDA_ISATTY = @GL_GNULIB_MDA_ISATTY@
+GL_GNULIB_MDA_LSEEK = @GL_GNULIB_MDA_LSEEK@
+GL_GNULIB_MDA_MEMCCPY = @GL_GNULIB_MDA_MEMCCPY@
+GL_GNULIB_MDA_MKDIR = @GL_GNULIB_MDA_MKDIR@
+GL_GNULIB_MDA_MKTEMP = @GL_GNULIB_MDA_MKTEMP@
+GL_GNULIB_MDA_OPEN = @GL_GNULIB_MDA_OPEN@
+GL_GNULIB_MDA_PUTENV = @GL_GNULIB_MDA_PUTENV@
+GL_GNULIB_MDA_PUTW = @GL_GNULIB_MDA_PUTW@
+GL_GNULIB_MDA_READ = @GL_GNULIB_MDA_READ@
+GL_GNULIB_MDA_RMDIR = @GL_GNULIB_MDA_RMDIR@
+GL_GNULIB_MDA_STRDUP = @GL_GNULIB_MDA_STRDUP@
+GL_GNULIB_MDA_SWAB = @GL_GNULIB_MDA_SWAB@
+GL_GNULIB_MDA_TEMPNAM = @GL_GNULIB_MDA_TEMPNAM@
+GL_GNULIB_MDA_TZSET = @GL_GNULIB_MDA_TZSET@
+GL_GNULIB_MDA_UMASK = @GL_GNULIB_MDA_UMASK@
+GL_GNULIB_MDA_UNLINK = @GL_GNULIB_MDA_UNLINK@
+GL_GNULIB_MDA_WCSDUP = @GL_GNULIB_MDA_WCSDUP@
+GL_GNULIB_MDA_WRITE = @GL_GNULIB_MDA_WRITE@
+GL_GNULIB_MEMCHR = @GL_GNULIB_MEMCHR@
+GL_GNULIB_MEMMEM = @GL_GNULIB_MEMMEM@
+GL_GNULIB_MEMPCPY = @GL_GNULIB_MEMPCPY@
+GL_GNULIB_MEMRCHR = @GL_GNULIB_MEMRCHR@
+GL_GNULIB_MKDIR = @GL_GNULIB_MKDIR@
+GL_GNULIB_MKDIRAT = @GL_GNULIB_MKDIRAT@
+GL_GNULIB_MKDTEMP = @GL_GNULIB_MKDTEMP@
+GL_GNULIB_MKFIFO = @GL_GNULIB_MKFIFO@
+GL_GNULIB_MKFIFOAT = @GL_GNULIB_MKFIFOAT@
+GL_GNULIB_MKNOD = @GL_GNULIB_MKNOD@
+GL_GNULIB_MKNODAT = @GL_GNULIB_MKNODAT@
+GL_GNULIB_MKOSTEMP = @GL_GNULIB_MKOSTEMP@
+GL_GNULIB_MKOSTEMPS = @GL_GNULIB_MKOSTEMPS@
+GL_GNULIB_MKSTEMP = @GL_GNULIB_MKSTEMP@
+GL_GNULIB_MKSTEMPS = @GL_GNULIB_MKSTEMPS@
+GL_GNULIB_MKTIME = @GL_GNULIB_MKTIME@
+GL_GNULIB_NANOSLEEP = @GL_GNULIB_NANOSLEEP@
+GL_GNULIB_NL_LANGINFO = @GL_GNULIB_NL_LANGINFO@
+GL_GNULIB_NONBLOCKING = @GL_GNULIB_NONBLOCKING@
+GL_GNULIB_OBSTACK_PRINTF = @GL_GNULIB_OBSTACK_PRINTF@
+GL_GNULIB_OBSTACK_PRINTF_POSIX = @GL_GNULIB_OBSTACK_PRINTF_POSIX@
+GL_GNULIB_OPEN = @GL_GNULIB_OPEN@
+GL_GNULIB_OPENAT = @GL_GNULIB_OPENAT@
+GL_GNULIB_OPENDIR = @GL_GNULIB_OPENDIR@
+GL_GNULIB_OVERRIDES_STRUCT_STAT = @GL_GNULIB_OVERRIDES_STRUCT_STAT@
+GL_GNULIB_PCLOSE = @GL_GNULIB_PCLOSE@
+GL_GNULIB_PERROR = @GL_GNULIB_PERROR@
+GL_GNULIB_PIPE = @GL_GNULIB_PIPE@
+GL_GNULIB_PIPE2 = @GL_GNULIB_PIPE2@
+GL_GNULIB_POPEN = @GL_GNULIB_POPEN@
+GL_GNULIB_POSIX_MEMALIGN = @GL_GNULIB_POSIX_MEMALIGN@
+GL_GNULIB_POSIX_OPENPT = @GL_GNULIB_POSIX_OPENPT@
+GL_GNULIB_PREAD = @GL_GNULIB_PREAD@
+GL_GNULIB_PRINTF = @GL_GNULIB_PRINTF@
+GL_GNULIB_PRINTF_POSIX = @GL_GNULIB_PRINTF_POSIX@
+GL_GNULIB_PSELECT = @GL_GNULIB_PSELECT@
+GL_GNULIB_PTHREAD_COND = @GL_GNULIB_PTHREAD_COND@
+GL_GNULIB_PTHREAD_MUTEX = @GL_GNULIB_PTHREAD_MUTEX@
+GL_GNULIB_PTHREAD_MUTEX_TIMEDLOCK = @GL_GNULIB_PTHREAD_MUTEX_TIMEDLOCK@
+GL_GNULIB_PTHREAD_ONCE = @GL_GNULIB_PTHREAD_ONCE@
+GL_GNULIB_PTHREAD_RWLOCK = @GL_GNULIB_PTHREAD_RWLOCK@
+GL_GNULIB_PTHREAD_SIGMASK = @GL_GNULIB_PTHREAD_SIGMASK@
+GL_GNULIB_PTHREAD_SPIN = @GL_GNULIB_PTHREAD_SPIN@
+GL_GNULIB_PTHREAD_THREAD = @GL_GNULIB_PTHREAD_THREAD@
+GL_GNULIB_PTHREAD_TSS = @GL_GNULIB_PTHREAD_TSS@
+GL_GNULIB_PTSNAME = @GL_GNULIB_PTSNAME@
+GL_GNULIB_PTSNAME_R = @GL_GNULIB_PTSNAME_R@
+GL_GNULIB_PUTC = @GL_GNULIB_PUTC@
+GL_GNULIB_PUTCHAR = @GL_GNULIB_PUTCHAR@
+GL_GNULIB_PUTENV = @GL_GNULIB_PUTENV@
+GL_GNULIB_PUTS = @GL_GNULIB_PUTS@
+GL_GNULIB_PWRITE = @GL_GNULIB_PWRITE@
+GL_GNULIB_QSORT_R = @GL_GNULIB_QSORT_R@
+GL_GNULIB_RAISE = @GL_GNULIB_RAISE@
+GL_GNULIB_RANDOM = @GL_GNULIB_RANDOM@
+GL_GNULIB_RANDOM_R = @GL_GNULIB_RANDOM_R@
+GL_GNULIB_RAWMEMCHR = @GL_GNULIB_RAWMEMCHR@
+GL_GNULIB_READ = @GL_GNULIB_READ@
+GL_GNULIB_READDIR = @GL_GNULIB_READDIR@
+GL_GNULIB_READLINK = @GL_GNULIB_READLINK@
+GL_GNULIB_READLINKAT = @GL_GNULIB_READLINKAT@
+GL_GNULIB_REALLOCARRAY = @GL_GNULIB_REALLOCARRAY@
+GL_GNULIB_REALLOC_POSIX = @GL_GNULIB_REALLOC_POSIX@
+GL_GNULIB_REALPATH = @GL_GNULIB_REALPATH@
+GL_GNULIB_RECV = @GL_GNULIB_RECV@
+GL_GNULIB_RECVFROM = @GL_GNULIB_RECVFROM@
+GL_GNULIB_REMOVE = @GL_GNULIB_REMOVE@
+GL_GNULIB_RENAME = @GL_GNULIB_RENAME@
+GL_GNULIB_RENAMEAT = @GL_GNULIB_RENAMEAT@
+GL_GNULIB_REWINDDIR = @GL_GNULIB_REWINDDIR@
+GL_GNULIB_RMDIR = @GL_GNULIB_RMDIR@
+GL_GNULIB_RPMATCH = @GL_GNULIB_RPMATCH@
+GL_GNULIB_SCANDIR = @GL_GNULIB_SCANDIR@
+GL_GNULIB_SCANF = @GL_GNULIB_SCANF@
+GL_GNULIB_SCHED_YIELD = @GL_GNULIB_SCHED_YIELD@
+GL_GNULIB_SECURE_GETENV = @GL_GNULIB_SECURE_GETENV@
+GL_GNULIB_SELECT = @GL_GNULIB_SELECT@
+GL_GNULIB_SEND = @GL_GNULIB_SEND@
+GL_GNULIB_SENDTO = @GL_GNULIB_SENDTO@
+GL_GNULIB_SETENV = @GL_GNULIB_SETENV@
+GL_GNULIB_SETHOSTNAME = @GL_GNULIB_SETHOSTNAME@
+GL_GNULIB_SETLOCALE = @GL_GNULIB_SETLOCALE@
+GL_GNULIB_SETLOCALE_NULL = @GL_GNULIB_SETLOCALE_NULL@
+GL_GNULIB_SETSOCKOPT = @GL_GNULIB_SETSOCKOPT@
+GL_GNULIB_SHUTDOWN = @GL_GNULIB_SHUTDOWN@
+GL_GNULIB_SIGABBREV_NP = @GL_GNULIB_SIGABBREV_NP@
+GL_GNULIB_SIGACTION = @GL_GNULIB_SIGACTION@
+GL_GNULIB_SIGDESCR_NP = @GL_GNULIB_SIGDESCR_NP@
+GL_GNULIB_SIGNAL_H_SIGPIPE = @GL_GNULIB_SIGNAL_H_SIGPIPE@
+GL_GNULIB_SIGPROCMASK = @GL_GNULIB_SIGPROCMASK@
+GL_GNULIB_SLEEP = @GL_GNULIB_SLEEP@
+GL_GNULIB_SNPRINTF = @GL_GNULIB_SNPRINTF@
+GL_GNULIB_SOCKET = @GL_GNULIB_SOCKET@
+GL_GNULIB_SPRINTF_POSIX = @GL_GNULIB_SPRINTF_POSIX@
+GL_GNULIB_STAT = @GL_GNULIB_STAT@
+GL_GNULIB_STDIO_H_NONBLOCKING = @GL_GNULIB_STDIO_H_NONBLOCKING@
+GL_GNULIB_STDIO_H_SIGPIPE = @GL_GNULIB_STDIO_H_SIGPIPE@
+GL_GNULIB_STPCPY = @GL_GNULIB_STPCPY@
+GL_GNULIB_STPNCPY = @GL_GNULIB_STPNCPY@
+GL_GNULIB_STRCASESTR = @GL_GNULIB_STRCASESTR@
+GL_GNULIB_STRCHRNUL = @GL_GNULIB_STRCHRNUL@
+GL_GNULIB_STRDUP = @GL_GNULIB_STRDUP@
+GL_GNULIB_STRERROR = @GL_GNULIB_STRERROR@
+GL_GNULIB_STRERRORNAME_NP = @GL_GNULIB_STRERRORNAME_NP@
+GL_GNULIB_STRERROR_R = @GL_GNULIB_STRERROR_R@
+GL_GNULIB_STRFTIME = @GL_GNULIB_STRFTIME@
+GL_GNULIB_STRNCAT = @GL_GNULIB_STRNCAT@
+GL_GNULIB_STRNDUP = @GL_GNULIB_STRNDUP@
+GL_GNULIB_STRNLEN = @GL_GNULIB_STRNLEN@
+GL_GNULIB_STRPBRK = @GL_GNULIB_STRPBRK@
+GL_GNULIB_STRPTIME = @GL_GNULIB_STRPTIME@
+GL_GNULIB_STRSEP = @GL_GNULIB_STRSEP@
+GL_GNULIB_STRSIGNAL = @GL_GNULIB_STRSIGNAL@
+GL_GNULIB_STRSTR = @GL_GNULIB_STRSTR@
+GL_GNULIB_STRTOD = @GL_GNULIB_STRTOD@
+GL_GNULIB_STRTOIMAX = @GL_GNULIB_STRTOIMAX@
+GL_GNULIB_STRTOK_R = @GL_GNULIB_STRTOK_R@
+GL_GNULIB_STRTOL = @GL_GNULIB_STRTOL@
+GL_GNULIB_STRTOLD = @GL_GNULIB_STRTOLD@
+GL_GNULIB_STRTOLL = @GL_GNULIB_STRTOLL@
+GL_GNULIB_STRTOUL = @GL_GNULIB_STRTOUL@
+GL_GNULIB_STRTOULL = @GL_GNULIB_STRTOULL@
+GL_GNULIB_STRTOUMAX = @GL_GNULIB_STRTOUMAX@
+GL_GNULIB_STRVERSCMP = @GL_GNULIB_STRVERSCMP@
+GL_GNULIB_SYMLINK = @GL_GNULIB_SYMLINK@
+GL_GNULIB_SYMLINKAT = @GL_GNULIB_SYMLINKAT@
+GL_GNULIB_SYSTEM_POSIX = @GL_GNULIB_SYSTEM_POSIX@
+GL_GNULIB_TIMEGM = @GL_GNULIB_TIMEGM@
+GL_GNULIB_TIMESPEC_GET = @GL_GNULIB_TIMESPEC_GET@
+GL_GNULIB_TIME_R = @GL_GNULIB_TIME_R@
+GL_GNULIB_TIME_RZ = @GL_GNULIB_TIME_RZ@
+GL_GNULIB_TMPFILE = @GL_GNULIB_TMPFILE@
+GL_GNULIB_TOWCTRANS = @GL_GNULIB_TOWCTRANS@
+GL_GNULIB_TRUNCATE = @GL_GNULIB_TRUNCATE@
+GL_GNULIB_TTYNAME_R = @GL_GNULIB_TTYNAME_R@
+GL_GNULIB_TZSET = @GL_GNULIB_TZSET@
+GL_GNULIB_UNISTD_H_GETOPT = @GL_GNULIB_UNISTD_H_GETOPT@
+GL_GNULIB_UNISTD_H_NONBLOCKING = @GL_GNULIB_UNISTD_H_NONBLOCKING@
+GL_GNULIB_UNISTD_H_SIGPIPE = @GL_GNULIB_UNISTD_H_SIGPIPE@
+GL_GNULIB_UNLINK = @GL_GNULIB_UNLINK@
+GL_GNULIB_UNLINKAT = @GL_GNULIB_UNLINKAT@
+GL_GNULIB_UNLOCKPT = @GL_GNULIB_UNLOCKPT@
+GL_GNULIB_UNSETENV = @GL_GNULIB_UNSETENV@
+GL_GNULIB_USLEEP = @GL_GNULIB_USLEEP@
+GL_GNULIB_UTIMENSAT = @GL_GNULIB_UTIMENSAT@
+GL_GNULIB_VASPRINTF = @GL_GNULIB_VASPRINTF@
+GL_GNULIB_VDPRINTF = @GL_GNULIB_VDPRINTF@
+GL_GNULIB_VFPRINTF = @GL_GNULIB_VFPRINTF@
+GL_GNULIB_VFPRINTF_POSIX = @GL_GNULIB_VFPRINTF_POSIX@
+GL_GNULIB_VFSCANF = @GL_GNULIB_VFSCANF@
+GL_GNULIB_VPRINTF = @GL_GNULIB_VPRINTF@
+GL_GNULIB_VPRINTF_POSIX = @GL_GNULIB_VPRINTF_POSIX@
+GL_GNULIB_VSCANF = @GL_GNULIB_VSCANF@
+GL_GNULIB_VSNPRINTF = @GL_GNULIB_VSNPRINTF@
+GL_GNULIB_VSPRINTF_POSIX = @GL_GNULIB_VSPRINTF_POSIX@
+GL_GNULIB_WCPCPY = @GL_GNULIB_WCPCPY@
+GL_GNULIB_WCPNCPY = @GL_GNULIB_WCPNCPY@
+GL_GNULIB_WCRTOMB = @GL_GNULIB_WCRTOMB@
+GL_GNULIB_WCSCASECMP = @GL_GNULIB_WCSCASECMP@
+GL_GNULIB_WCSCAT = @GL_GNULIB_WCSCAT@
+GL_GNULIB_WCSCHR = @GL_GNULIB_WCSCHR@
+GL_GNULIB_WCSCMP = @GL_GNULIB_WCSCMP@
+GL_GNULIB_WCSCOLL = @GL_GNULIB_WCSCOLL@
+GL_GNULIB_WCSCPY = @GL_GNULIB_WCSCPY@
+GL_GNULIB_WCSCSPN = @GL_GNULIB_WCSCSPN@
+GL_GNULIB_WCSDUP = @GL_GNULIB_WCSDUP@
+GL_GNULIB_WCSFTIME = @GL_GNULIB_WCSFTIME@
+GL_GNULIB_WCSLEN = @GL_GNULIB_WCSLEN@
+GL_GNULIB_WCSNCASECMP = @GL_GNULIB_WCSNCASECMP@
+GL_GNULIB_WCSNCAT = @GL_GNULIB_WCSNCAT@
+GL_GNULIB_WCSNCMP = @GL_GNULIB_WCSNCMP@
+GL_GNULIB_WCSNCPY = @GL_GNULIB_WCSNCPY@
+GL_GNULIB_WCSNLEN = @GL_GNULIB_WCSNLEN@
+GL_GNULIB_WCSNRTOMBS = @GL_GNULIB_WCSNRTOMBS@
+GL_GNULIB_WCSPBRK = @GL_GNULIB_WCSPBRK@
+GL_GNULIB_WCSRCHR = @GL_GNULIB_WCSRCHR@
+GL_GNULIB_WCSRTOMBS = @GL_GNULIB_WCSRTOMBS@
+GL_GNULIB_WCSSPN = @GL_GNULIB_WCSSPN@
+GL_GNULIB_WCSSTR = @GL_GNULIB_WCSSTR@
+GL_GNULIB_WCSTOK = @GL_GNULIB_WCSTOK@
+GL_GNULIB_WCSWIDTH = @GL_GNULIB_WCSWIDTH@
+GL_GNULIB_WCSXFRM = @GL_GNULIB_WCSXFRM@
+GL_GNULIB_WCTOB = @GL_GNULIB_WCTOB@
+GL_GNULIB_WCTOMB = @GL_GNULIB_WCTOMB@
+GL_GNULIB_WCTRANS = @GL_GNULIB_WCTRANS@
+GL_GNULIB_WCTYPE = @GL_GNULIB_WCTYPE@
+GL_GNULIB_WCWIDTH = @GL_GNULIB_WCWIDTH@
+GL_GNULIB_WMEMCHR = @GL_GNULIB_WMEMCHR@
+GL_GNULIB_WMEMCMP = @GL_GNULIB_WMEMCMP@
+GL_GNULIB_WMEMCPY = @GL_GNULIB_WMEMCPY@
+GL_GNULIB_WMEMMOVE = @GL_GNULIB_WMEMMOVE@
+GL_GNULIB_WMEMPCPY = @GL_GNULIB_WMEMPCPY@
+GL_GNULIB_WMEMSET = @GL_GNULIB_WMEMSET@
+GL_GNULIB_WRITE = @GL_GNULIB_WRITE@
+GL_GNULIB__EXIT = @GL_GNULIB__EXIT@
+GMSGFMT = @GMSGFMT@
+GMSGFMT_015 = @GMSGFMT_015@
+GNULIBHEADERS_OVERRIDE_WINT_T = @GNULIBHEADERS_OVERRIDE_WINT_T@
+GNULIB_GETTIMEOFDAY = @GNULIB_GETTIMEOFDAY@
+GNULIB_TEST_WARN_CFLAGS = @GNULIB_TEST_WARN_CFLAGS@
+GNULIB_WARN_CFLAGS = @GNULIB_WARN_CFLAGS@
+GREP = @GREP@
+HAVE_ACCEPT4 = @HAVE_ACCEPT4@
+HAVE_ALIGNED_ALLOC = @HAVE_ALIGNED_ALLOC@
+HAVE_ALLOCA_H = @HAVE_ALLOCA_H@
+HAVE_ALPHASORT = @HAVE_ALPHASORT@
+HAVE_ARPA_INET_H = @HAVE_ARPA_INET_H@
+HAVE_ATOLL = @HAVE_ATOLL@
+HAVE_BTOWC = @HAVE_BTOWC@
+HAVE_C99_STDINT_H = @HAVE_C99_STDINT_H@
+HAVE_CANONICALIZE_FILE_NAME = @HAVE_CANONICALIZE_FILE_NAME@
+HAVE_CHOWN = @HAVE_CHOWN@
+HAVE_CLOSEDIR = @HAVE_CLOSEDIR@
+HAVE_COPY_FILE_RANGE = @HAVE_COPY_FILE_RANGE@
+HAVE_CRTDEFS_H = @HAVE_CRTDEFS_H@
+HAVE_DECL_DIRFD = @HAVE_DECL_DIRFD@
+HAVE_DECL_ECVT = @HAVE_DECL_ECVT@
+HAVE_DECL_ENVIRON = @HAVE_DECL_ENVIRON@
+HAVE_DECL_EXECVPE = @HAVE_DECL_EXECVPE@
+HAVE_DECL_FCHDIR = @HAVE_DECL_FCHDIR@
+HAVE_DECL_FCLOSEALL = @HAVE_DECL_FCLOSEALL@
+HAVE_DECL_FCVT = @HAVE_DECL_FCVT@
+HAVE_DECL_FDATASYNC = @HAVE_DECL_FDATASYNC@
+HAVE_DECL_FDOPENDIR = @HAVE_DECL_FDOPENDIR@
+HAVE_DECL_FPURGE = @HAVE_DECL_FPURGE@
+HAVE_DECL_FSEEKO = @HAVE_DECL_FSEEKO@
+HAVE_DECL_FTELLO = @HAVE_DECL_FTELLO@
+HAVE_DECL_GCVT = @HAVE_DECL_GCVT@
+HAVE_DECL_GETDELIM = @HAVE_DECL_GETDELIM@
+HAVE_DECL_GETDOMAINNAME = @HAVE_DECL_GETDOMAINNAME@
+HAVE_DECL_GETLINE = @HAVE_DECL_GETLINE@
+HAVE_DECL_GETLOADAVG = @HAVE_DECL_GETLOADAVG@
+HAVE_DECL_GETLOGIN = @HAVE_DECL_GETLOGIN@
+HAVE_DECL_GETLOGIN_R = @HAVE_DECL_GETLOGIN_R@
+HAVE_DECL_GETPAGESIZE = @HAVE_DECL_GETPAGESIZE@
+HAVE_DECL_GETUSERSHELL = @HAVE_DECL_GETUSERSHELL@
+HAVE_DECL_IMAXABS = @HAVE_DECL_IMAXABS@
+HAVE_DECL_IMAXDIV = @HAVE_DECL_IMAXDIV@
+HAVE_DECL_INET_NTOP = @HAVE_DECL_INET_NTOP@
+HAVE_DECL_INET_PTON = @HAVE_DECL_INET_PTON@
+HAVE_DECL_INITSTATE = @HAVE_DECL_INITSTATE@
+HAVE_DECL_LOCALTIME_R = @HAVE_DECL_LOCALTIME_R@
+HAVE_DECL_MEMMEM = @HAVE_DECL_MEMMEM@
+HAVE_DECL_MEMRCHR = @HAVE_DECL_MEMRCHR@
+HAVE_DECL_OBSTACK_PRINTF = @HAVE_DECL_OBSTACK_PRINTF@
+HAVE_DECL_SETENV = @HAVE_DECL_SETENV@
+HAVE_DECL_SETHOSTNAME = @HAVE_DECL_SETHOSTNAME@
+HAVE_DECL_SETSTATE = @HAVE_DECL_SETSTATE@
+HAVE_DECL_SNPRINTF = @HAVE_DECL_SNPRINTF@
+HAVE_DECL_STRDUP = @HAVE_DECL_STRDUP@
+HAVE_DECL_STRERROR_R = @HAVE_DECL_STRERROR_R@
+HAVE_DECL_STRNDUP = @HAVE_DECL_STRNDUP@
+HAVE_DECL_STRNLEN = @HAVE_DECL_STRNLEN@
+HAVE_DECL_STRSIGNAL = @HAVE_DECL_STRSIGNAL@
+HAVE_DECL_STRTOIMAX = @HAVE_DECL_STRTOIMAX@
+HAVE_DECL_STRTOK_R = @HAVE_DECL_STRTOK_R@
+HAVE_DECL_STRTOUMAX = @HAVE_DECL_STRTOUMAX@
+HAVE_DECL_TRUNCATE = @HAVE_DECL_TRUNCATE@
+HAVE_DECL_TTYNAME_R = @HAVE_DECL_TTYNAME_R@
+HAVE_DECL_UNSETENV = @HAVE_DECL_UNSETENV@
+HAVE_DECL_VSNPRINTF = @HAVE_DECL_VSNPRINTF@
+HAVE_DECL_WCSDUP = @HAVE_DECL_WCSDUP@
+HAVE_DECL_WCTOB = @HAVE_DECL_WCTOB@
+HAVE_DECL_WCWIDTH = @HAVE_DECL_WCWIDTH@
+HAVE_DIRENT_H = @HAVE_DIRENT_H@
+HAVE_DPRINTF = @HAVE_DPRINTF@
+HAVE_DUP3 = @HAVE_DUP3@
+HAVE_DUPLOCALE = @HAVE_DUPLOCALE@
+HAVE_EUIDACCESS = @HAVE_EUIDACCESS@
+HAVE_EXECVPE = @HAVE_EXECVPE@
+HAVE_EXPLICIT_BZERO = @HAVE_EXPLICIT_BZERO@
+HAVE_FACCESSAT = @HAVE_FACCESSAT@
+HAVE_FCHDIR = @HAVE_FCHDIR@
+HAVE_FCHMODAT = @HAVE_FCHMODAT@
+HAVE_FCHOWNAT = @HAVE_FCHOWNAT@
+HAVE_FCNTL = @HAVE_FCNTL@
+HAVE_FDATASYNC = @HAVE_FDATASYNC@
+HAVE_FDOPENDIR = @HAVE_FDOPENDIR@
+HAVE_FEATURES_H = @HAVE_FEATURES_H@
+HAVE_FFSL = @HAVE_FFSL@
+HAVE_FFSLL = @HAVE_FFSLL@
+HAVE_FNMATCH = @HAVE_FNMATCH@
+HAVE_FNMATCH_H = @HAVE_FNMATCH_H@
+HAVE_FREELOCALE = @HAVE_FREELOCALE@
+HAVE_FSEEKO = @HAVE_FSEEKO@
+HAVE_FSTATAT = @HAVE_FSTATAT@
+HAVE_FSYNC = @HAVE_FSYNC@
+HAVE_FTELLO = @HAVE_FTELLO@
+HAVE_FTRUNCATE = @HAVE_FTRUNCATE@
+HAVE_FUTIMENS = @HAVE_FUTIMENS@
+HAVE_GETDTABLESIZE = @HAVE_GETDTABLESIZE@
+HAVE_GETENTROPY = @HAVE_GETENTROPY@
+HAVE_GETGROUPS = @HAVE_GETGROUPS@
+HAVE_GETHOSTNAME = @HAVE_GETHOSTNAME@
+HAVE_GETLOGIN = @HAVE_GETLOGIN@
+HAVE_GETOPT_H = @HAVE_GETOPT_H@
+HAVE_GETPAGESIZE = @HAVE_GETPAGESIZE@
+HAVE_GETPASS = @HAVE_GETPASS@
+HAVE_GETSUBOPT = @HAVE_GETSUBOPT@
+HAVE_GETTIMEOFDAY = @HAVE_GETTIMEOFDAY@
+HAVE_GETUMASK = @HAVE_GETUMASK@
+HAVE_GRANTPT = @HAVE_GRANTPT@
+HAVE_GROUP_MEMBER = @HAVE_GROUP_MEMBER@
+HAVE_IMAXDIV_T = @HAVE_IMAXDIV_T@
+HAVE_INITSTATE = @HAVE_INITSTATE@
+HAVE_INTTYPES_H = @HAVE_INTTYPES_H@
+HAVE_ISBLANK = @HAVE_ISBLANK@
+HAVE_ISWBLANK = @HAVE_ISWBLANK@
+HAVE_ISWCNTRL = @HAVE_ISWCNTRL@
+HAVE_LANGINFO_ALTMON = @HAVE_LANGINFO_ALTMON@
+HAVE_LANGINFO_CODESET = @HAVE_LANGINFO_CODESET@
+HAVE_LANGINFO_ERA = @HAVE_LANGINFO_ERA@
+HAVE_LANGINFO_H = @HAVE_LANGINFO_H@
+HAVE_LANGINFO_T_FMT_AMPM = @HAVE_LANGINFO_T_FMT_AMPM@
+HAVE_LANGINFO_YESEXPR = @HAVE_LANGINFO_YESEXPR@
+HAVE_LCHMOD = @HAVE_LCHMOD@
+HAVE_LCHOWN = @HAVE_LCHOWN@
+HAVE_LIBSIGSEGV = @HAVE_LIBSIGSEGV@
+HAVE_LINK = @HAVE_LINK@
+HAVE_LINKAT = @HAVE_LINKAT@
+HAVE_LSTAT = @HAVE_LSTAT@
+HAVE_MAX_ALIGN_T = @HAVE_MAX_ALIGN_T@
+HAVE_MBRLEN = @HAVE_MBRLEN@
+HAVE_MBRTOWC = @HAVE_MBRTOWC@
+HAVE_MBSINIT = @HAVE_MBSINIT@
+HAVE_MBSLEN = @HAVE_MBSLEN@
+HAVE_MBSNRTOWCS = @HAVE_MBSNRTOWCS@
+HAVE_MBSRTOWCS = @HAVE_MBSRTOWCS@
+HAVE_MBTOWC = @HAVE_MBTOWC@
+HAVE_MEMPCPY = @HAVE_MEMPCPY@
+HAVE_MKDIRAT = @HAVE_MKDIRAT@
+HAVE_MKDTEMP = @HAVE_MKDTEMP@
+HAVE_MKFIFO = @HAVE_MKFIFO@
+HAVE_MKFIFOAT = @HAVE_MKFIFOAT@
+HAVE_MKNOD = @HAVE_MKNOD@
+HAVE_MKNODAT = @HAVE_MKNODAT@
+HAVE_MKOSTEMP = @HAVE_MKOSTEMP@
+HAVE_MKOSTEMPS = @HAVE_MKOSTEMPS@
+HAVE_MKSTEMP = @HAVE_MKSTEMP@
+HAVE_MKSTEMPS = @HAVE_MKSTEMPS@
+HAVE_MSVC_INVALID_PARAMETER_HANDLER = @HAVE_MSVC_INVALID_PARAMETER_HANDLER@
+HAVE_NANOSLEEP = @HAVE_NANOSLEEP@
+HAVE_NETINET_IN_H = @HAVE_NETINET_IN_H@
+HAVE_NEWLOCALE = @HAVE_NEWLOCALE@
+HAVE_NL_LANGINFO = @HAVE_NL_LANGINFO@
+HAVE_OPENAT = @HAVE_OPENAT@
+HAVE_OPENDIR = @HAVE_OPENDIR@
+HAVE_OS_H = @HAVE_OS_H@
+HAVE_PCLOSE = @HAVE_PCLOSE@
+HAVE_PIPE = @HAVE_PIPE@
+HAVE_PIPE2 = @HAVE_PIPE2@
+HAVE_POPEN = @HAVE_POPEN@
+HAVE_POSIX_MEMALIGN = @HAVE_POSIX_MEMALIGN@
+HAVE_POSIX_OPENPT = @HAVE_POSIX_OPENPT@
+HAVE_POSIX_SIGNALBLOCKING = @HAVE_POSIX_SIGNALBLOCKING@
+HAVE_PREAD = @HAVE_PREAD@
+HAVE_PSELECT = @HAVE_PSELECT@
+HAVE_PTHREAD_ATTR_DESTROY = @HAVE_PTHREAD_ATTR_DESTROY@
+HAVE_PTHREAD_ATTR_GETDETACHSTATE = @HAVE_PTHREAD_ATTR_GETDETACHSTATE@
+HAVE_PTHREAD_ATTR_INIT = @HAVE_PTHREAD_ATTR_INIT@
+HAVE_PTHREAD_ATTR_SETDETACHSTATE = @HAVE_PTHREAD_ATTR_SETDETACHSTATE@
+HAVE_PTHREAD_CONDATTR_DESTROY = @HAVE_PTHREAD_CONDATTR_DESTROY@
+HAVE_PTHREAD_CONDATTR_INIT = @HAVE_PTHREAD_CONDATTR_INIT@
+HAVE_PTHREAD_COND_BROADCAST = @HAVE_PTHREAD_COND_BROADCAST@
+HAVE_PTHREAD_COND_DESTROY = @HAVE_PTHREAD_COND_DESTROY@
+HAVE_PTHREAD_COND_INIT = @HAVE_PTHREAD_COND_INIT@
+HAVE_PTHREAD_COND_SIGNAL = @HAVE_PTHREAD_COND_SIGNAL@
+HAVE_PTHREAD_COND_TIMEDWAIT = @HAVE_PTHREAD_COND_TIMEDWAIT@
+HAVE_PTHREAD_COND_WAIT = @HAVE_PTHREAD_COND_WAIT@
+HAVE_PTHREAD_CREATE = @HAVE_PTHREAD_CREATE@
+HAVE_PTHREAD_CREATE_DETACHED = @HAVE_PTHREAD_CREATE_DETACHED@
+HAVE_PTHREAD_DETACH = @HAVE_PTHREAD_DETACH@
+HAVE_PTHREAD_EQUAL = @HAVE_PTHREAD_EQUAL@
+HAVE_PTHREAD_EXIT = @HAVE_PTHREAD_EXIT@
+HAVE_PTHREAD_GETSPECIFIC = @HAVE_PTHREAD_GETSPECIFIC@
+HAVE_PTHREAD_H = @HAVE_PTHREAD_H@
+HAVE_PTHREAD_JOIN = @HAVE_PTHREAD_JOIN@
+HAVE_PTHREAD_KEY_CREATE = @HAVE_PTHREAD_KEY_CREATE@
+HAVE_PTHREAD_KEY_DELETE = @HAVE_PTHREAD_KEY_DELETE@
+HAVE_PTHREAD_MUTEXATTR_DESTROY = @HAVE_PTHREAD_MUTEXATTR_DESTROY@
+HAVE_PTHREAD_MUTEXATTR_GETROBUST = @HAVE_PTHREAD_MUTEXATTR_GETROBUST@
+HAVE_PTHREAD_MUTEXATTR_GETTYPE = @HAVE_PTHREAD_MUTEXATTR_GETTYPE@
+HAVE_PTHREAD_MUTEXATTR_INIT = @HAVE_PTHREAD_MUTEXATTR_INIT@
+HAVE_PTHREAD_MUTEXATTR_SETROBUST = @HAVE_PTHREAD_MUTEXATTR_SETROBUST@
+HAVE_PTHREAD_MUTEXATTR_SETTYPE = @HAVE_PTHREAD_MUTEXATTR_SETTYPE@
+HAVE_PTHREAD_MUTEX_DESTROY = @HAVE_PTHREAD_MUTEX_DESTROY@
+HAVE_PTHREAD_MUTEX_INIT = @HAVE_PTHREAD_MUTEX_INIT@
+HAVE_PTHREAD_MUTEX_LOCK = @HAVE_PTHREAD_MUTEX_LOCK@
+HAVE_PTHREAD_MUTEX_RECURSIVE = @HAVE_PTHREAD_MUTEX_RECURSIVE@
+HAVE_PTHREAD_MUTEX_ROBUST = @HAVE_PTHREAD_MUTEX_ROBUST@
+HAVE_PTHREAD_MUTEX_TIMEDLOCK = @HAVE_PTHREAD_MUTEX_TIMEDLOCK@
+HAVE_PTHREAD_MUTEX_TRYLOCK = @HAVE_PTHREAD_MUTEX_TRYLOCK@
+HAVE_PTHREAD_MUTEX_UNLOCK = @HAVE_PTHREAD_MUTEX_UNLOCK@
+HAVE_PTHREAD_ONCE = @HAVE_PTHREAD_ONCE@
+HAVE_PTHREAD_PROCESS_SHARED = @HAVE_PTHREAD_PROCESS_SHARED@
+HAVE_PTHREAD_RWLOCKATTR_DESTROY = @HAVE_PTHREAD_RWLOCKATTR_DESTROY@
+HAVE_PTHREAD_RWLOCKATTR_INIT = @HAVE_PTHREAD_RWLOCKATTR_INIT@
+HAVE_PTHREAD_RWLOCK_DESTROY = @HAVE_PTHREAD_RWLOCK_DESTROY@
+HAVE_PTHREAD_RWLOCK_INIT = @HAVE_PTHREAD_RWLOCK_INIT@
+HAVE_PTHREAD_RWLOCK_RDLOCK = @HAVE_PTHREAD_RWLOCK_RDLOCK@
+HAVE_PTHREAD_RWLOCK_TIMEDRDLOCK = @HAVE_PTHREAD_RWLOCK_TIMEDRDLOCK@
+HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK = @HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK@
+HAVE_PTHREAD_RWLOCK_TRYRDLOCK = @HAVE_PTHREAD_RWLOCK_TRYRDLOCK@
+HAVE_PTHREAD_RWLOCK_TRYWRLOCK = @HAVE_PTHREAD_RWLOCK_TRYWRLOCK@
+HAVE_PTHREAD_RWLOCK_UNLOCK = @HAVE_PTHREAD_RWLOCK_UNLOCK@
+HAVE_PTHREAD_RWLOCK_WRLOCK = @HAVE_PTHREAD_RWLOCK_WRLOCK@
+HAVE_PTHREAD_SELF = @HAVE_PTHREAD_SELF@
+HAVE_PTHREAD_SETSPECIFIC = @HAVE_PTHREAD_SETSPECIFIC@
+HAVE_PTHREAD_SIGMASK = @HAVE_PTHREAD_SIGMASK@
+HAVE_PTHREAD_SPINLOCK_T = @HAVE_PTHREAD_SPINLOCK_T@
+HAVE_PTHREAD_SPIN_DESTROY = @HAVE_PTHREAD_SPIN_DESTROY@
+HAVE_PTHREAD_SPIN_INIT = @HAVE_PTHREAD_SPIN_INIT@
+HAVE_PTHREAD_SPIN_LOCK = @HAVE_PTHREAD_SPIN_LOCK@
+HAVE_PTHREAD_SPIN_TRYLOCK = @HAVE_PTHREAD_SPIN_TRYLOCK@
+HAVE_PTHREAD_SPIN_UNLOCK = @HAVE_PTHREAD_SPIN_UNLOCK@
+HAVE_PTHREAD_T = @HAVE_PTHREAD_T@
+HAVE_PTSNAME = @HAVE_PTSNAME@
+HAVE_PTSNAME_R = @HAVE_PTSNAME_R@
+HAVE_PWRITE = @HAVE_PWRITE@
+HAVE_QSORT_R = @HAVE_QSORT_R@
+HAVE_RAISE = @HAVE_RAISE@
+HAVE_RANDOM = @HAVE_RANDOM@
+HAVE_RANDOM_H = @HAVE_RANDOM_H@
+HAVE_RANDOM_R = @HAVE_RANDOM_R@
+HAVE_RAWMEMCHR = @HAVE_RAWMEMCHR@
+HAVE_READDIR = @HAVE_READDIR@
+HAVE_READLINK = @HAVE_READLINK@
+HAVE_READLINKAT = @HAVE_READLINKAT@
+HAVE_REALLOCARRAY = @HAVE_REALLOCARRAY@
+HAVE_REALPATH = @HAVE_REALPATH@
+HAVE_RENAMEAT = @HAVE_RENAMEAT@
+HAVE_REWINDDIR = @HAVE_REWINDDIR@
+HAVE_RPMATCH = @HAVE_RPMATCH@
+HAVE_SA_FAMILY_T = @HAVE_SA_FAMILY_T@
+HAVE_SCANDIR = @HAVE_SCANDIR@
+HAVE_SCHED_H = @HAVE_SCHED_H@
+HAVE_SCHED_YIELD = @HAVE_SCHED_YIELD@
+HAVE_SECURE_GETENV = @HAVE_SECURE_GETENV@
+HAVE_SETENV = @HAVE_SETENV@
+HAVE_SETHOSTNAME = @HAVE_SETHOSTNAME@
+HAVE_SETSTATE = @HAVE_SETSTATE@
+HAVE_SIGABBREV_NP = @HAVE_SIGABBREV_NP@
+HAVE_SIGACTION = @HAVE_SIGACTION@
+HAVE_SIGDESCR_NP = @HAVE_SIGDESCR_NP@
+HAVE_SIGHANDLER_T = @HAVE_SIGHANDLER_T@
+HAVE_SIGINFO_T = @HAVE_SIGINFO_T@
+HAVE_SIGNED_SIG_ATOMIC_T = @HAVE_SIGNED_SIG_ATOMIC_T@
+HAVE_SIGNED_WCHAR_T = @HAVE_SIGNED_WCHAR_T@
+HAVE_SIGNED_WINT_T = @HAVE_SIGNED_WINT_T@
+HAVE_SIGSET_T = @HAVE_SIGSET_T@
+HAVE_SLEEP = @HAVE_SLEEP@
+HAVE_STDINT_H = @HAVE_STDINT_H@
+HAVE_STPCPY = @HAVE_STPCPY@
+HAVE_STPNCPY = @HAVE_STPNCPY@
+HAVE_STRCASESTR = @HAVE_STRCASESTR@
+HAVE_STRCHRNUL = @HAVE_STRCHRNUL@
+HAVE_STRERRORNAME_NP = @HAVE_STRERRORNAME_NP@
+HAVE_STRPBRK = @HAVE_STRPBRK@
+HAVE_STRPTIME = @HAVE_STRPTIME@
+HAVE_STRSEP = @HAVE_STRSEP@
+HAVE_STRTOD = @HAVE_STRTOD@
+HAVE_STRTOL = @HAVE_STRTOL@
+HAVE_STRTOLD = @HAVE_STRTOLD@
+HAVE_STRTOLL = @HAVE_STRTOLL@
+HAVE_STRTOUL = @HAVE_STRTOUL@
+HAVE_STRTOULL = @HAVE_STRTOULL@
+HAVE_STRUCT_RANDOM_DATA = @HAVE_STRUCT_RANDOM_DATA@
+HAVE_STRUCT_SCHED_PARAM = @HAVE_STRUCT_SCHED_PARAM@
+HAVE_STRUCT_SIGACTION_SA_SIGACTION = @HAVE_STRUCT_SIGACTION_SA_SIGACTION@
+HAVE_STRUCT_SOCKADDR_STORAGE = @HAVE_STRUCT_SOCKADDR_STORAGE@
+HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY = @HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY@
+HAVE_STRUCT_TIMEVAL = @HAVE_STRUCT_TIMEVAL@
+HAVE_STRVERSCMP = @HAVE_STRVERSCMP@
+HAVE_SYMLINK = @HAVE_SYMLINK@
+HAVE_SYMLINKAT = @HAVE_SYMLINKAT@
+HAVE_SYS_BITYPES_H = @HAVE_SYS_BITYPES_H@
+HAVE_SYS_CDEFS_H = @HAVE_SYS_CDEFS_H@
+HAVE_SYS_INTTYPES_H = @HAVE_SYS_INTTYPES_H@
+HAVE_SYS_IOCTL_H = @HAVE_SYS_IOCTL_H@
+HAVE_SYS_LOADAVG_H = @HAVE_SYS_LOADAVG_H@
+HAVE_SYS_PARAM_H = @HAVE_SYS_PARAM_H@
+HAVE_SYS_SELECT_H = @HAVE_SYS_SELECT_H@
+HAVE_SYS_SOCKET_H = @HAVE_SYS_SOCKET_H@
+HAVE_SYS_TIME_H = @HAVE_SYS_TIME_H@
+HAVE_SYS_TYPES_H = @HAVE_SYS_TYPES_H@
+HAVE_SYS_UIO_H = @HAVE_SYS_UIO_H@
+HAVE_TIMEGM = @HAVE_TIMEGM@
+HAVE_TIMESPEC_GET = @HAVE_TIMESPEC_GET@
+HAVE_TIMEZONE_T = @HAVE_TIMEZONE_T@
+HAVE_TYPE_VOLATILE_SIG_ATOMIC_T = @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@
+HAVE_UNISTD_H = @HAVE_UNISTD_H@
+HAVE_UNLINKAT = @HAVE_UNLINKAT@
+HAVE_UNLOCKPT = @HAVE_UNLOCKPT@
+HAVE_USLEEP = @HAVE_USLEEP@
+HAVE_UTIMENSAT = @HAVE_UTIMENSAT@
+HAVE_VASPRINTF = @HAVE_VASPRINTF@
+HAVE_VDPRINTF = @HAVE_VDPRINTF@
+HAVE_VISIBILITY = @HAVE_VISIBILITY@
+HAVE_WCHAR_H = @HAVE_WCHAR_H@
+HAVE_WCHAR_T = @HAVE_WCHAR_T@
+HAVE_WCPCPY = @HAVE_WCPCPY@
+HAVE_WCPNCPY = @HAVE_WCPNCPY@
+HAVE_WCRTOMB = @HAVE_WCRTOMB@
+HAVE_WCSCASECMP = @HAVE_WCSCASECMP@
+HAVE_WCSCAT = @HAVE_WCSCAT@
+HAVE_WCSCHR = @HAVE_WCSCHR@
+HAVE_WCSCMP = @HAVE_WCSCMP@
+HAVE_WCSCOLL = @HAVE_WCSCOLL@
+HAVE_WCSCPY = @HAVE_WCSCPY@
+HAVE_WCSCSPN = @HAVE_WCSCSPN@
+HAVE_WCSDUP = @HAVE_WCSDUP@
+HAVE_WCSFTIME = @HAVE_WCSFTIME@
+HAVE_WCSLEN = @HAVE_WCSLEN@
+HAVE_WCSNCASECMP = @HAVE_WCSNCASECMP@
+HAVE_WCSNCAT = @HAVE_WCSNCAT@
+HAVE_WCSNCMP = @HAVE_WCSNCMP@
+HAVE_WCSNCPY = @HAVE_WCSNCPY@
+HAVE_WCSNLEN = @HAVE_WCSNLEN@
+HAVE_WCSNRTOMBS = @HAVE_WCSNRTOMBS@
+HAVE_WCSPBRK = @HAVE_WCSPBRK@
+HAVE_WCSRCHR = @HAVE_WCSRCHR@
+HAVE_WCSRTOMBS = @HAVE_WCSRTOMBS@
+HAVE_WCSSPN = @HAVE_WCSSPN@
+HAVE_WCSSTR = @HAVE_WCSSTR@
+HAVE_WCSTOK = @HAVE_WCSTOK@
+HAVE_WCSWIDTH = @HAVE_WCSWIDTH@
+HAVE_WCSXFRM = @HAVE_WCSXFRM@
+HAVE_WCTRANS_T = @HAVE_WCTRANS_T@
+HAVE_WCTYPE_H = @HAVE_WCTYPE_H@
+HAVE_WCTYPE_T = @HAVE_WCTYPE_T@
+HAVE_WINSOCK2_H = @HAVE_WINSOCK2_H@
+HAVE_WINT_T = @HAVE_WINT_T@
+HAVE_WMEMCHR = @HAVE_WMEMCHR@
+HAVE_WMEMCMP = @HAVE_WMEMCMP@
+HAVE_WMEMCPY = @HAVE_WMEMCPY@
+HAVE_WMEMMOVE = @HAVE_WMEMMOVE@
+HAVE_WMEMPCPY = @HAVE_WMEMPCPY@
+HAVE_WMEMSET = @HAVE_WMEMSET@
+HAVE_WS2TCPIP_H = @HAVE_WS2TCPIP_H@
+HAVE_XLOCALE_H = @HAVE_XLOCALE_H@
+HAVE__BOOL = @HAVE__BOOL@
+HAVE__EXIT = @HAVE__EXIT@
+HOST_CPU = @HOST_CPU@
+HOST_CPU_C_ABI = @HOST_CPU_C_ABI@
+ICONV_CONST = @ICONV_CONST@
+ICONV_H = @ICONV_H@
+INCLUDE_NEXT = @INCLUDE_NEXT@
+INCLUDE_NEXT_AS_FIRST_DIRECTIVE = @INCLUDE_NEXT_AS_FIRST_DIRECTIVE@
+INET_PTON_LIB = @INET_PTON_LIB@
+INSTALL = @INSTALL@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+INT32_MAX_LT_INTMAX_MAX = @INT32_MAX_LT_INTMAX_MAX@
+INT64_MAX_EQ_LONG_MAX = @INT64_MAX_EQ_LONG_MAX@
+INTLLIBS = @INTLLIBS@
+INTL_MACOSX_LIBS = @INTL_MACOSX_LIBS@
+LDFLAGS = @LDFLAGS@
+LIBCSTACK = @LIBCSTACK@
+LIBGREPUTILS_LIBDEPS = @LIBGREPUTILS_LIBDEPS@
+LIBGREPUTILS_LTLIBDEPS = @LIBGREPUTILS_LTLIBDEPS@
+LIBICONV = @LIBICONV@
+LIBINTL = @LIBINTL@
+LIBMULTITHREAD = @LIBMULTITHREAD@
+LIBOBJS = @LIBOBJS@
+LIBPMULTITHREAD = @LIBPMULTITHREAD@
+LIBPTHREAD = @LIBPTHREAD@
+LIBS = @LIBS@
+LIBSIGSEGV = @LIBSIGSEGV@
+LIBSIGSEGV_PREFIX = @LIBSIGSEGV_PREFIX@
+LIBSOCKET = @LIBSOCKET@
+LIBSTDTHREAD = @LIBSTDTHREAD@
+LIBTESTS_LIBDEPS = @LIBTESTS_LIBDEPS@
+LIBTHREAD = @LIBTHREAD@
+LIBUNISTRING_UNISTR_H = @LIBUNISTRING_UNISTR_H@
+LIBUNISTRING_UNITYPES_H = @LIBUNISTRING_UNITYPES_H@
+LIBUNISTRING_UNIWIDTH_H = @LIBUNISTRING_UNIWIDTH_H@
+LIB_HARD_LOCALE = @LIB_HARD_LOCALE@
+LIB_MBRTOWC = @LIB_MBRTOWC@
+LIB_NANOSLEEP = @LIB_NANOSLEEP@
+LIB_NL_LANGINFO = @LIB_NL_LANGINFO@
+LIB_PTHREAD = @LIB_PTHREAD@
+LIB_PTHREAD_SIGMASK = @LIB_PTHREAD_SIGMASK@
+LIB_SCHED_YIELD = @LIB_SCHED_YIELD@
+LIB_SELECT = @LIB_SELECT@
+LIB_SETLOCALE = @LIB_SETLOCALE@
+LIB_SETLOCALE_NULL = @LIB_SETLOCALE_NULL@
+LIMITS_H = @LIMITS_H@
+LOCALCHARSET_TESTS_ENVIRONMENT = @LOCALCHARSET_TESTS_ENVIRONMENT@
+LOCALENAME_ENHANCE_LOCALE_FUNCS = @LOCALENAME_ENHANCE_LOCALE_FUNCS@
+LOCALE_FR = @LOCALE_FR@
+LOCALE_FR_UTF8 = @LOCALE_FR_UTF8@
+LOCALE_JA = @LOCALE_JA@
+LOCALE_TR_UTF8 = @LOCALE_TR_UTF8@
+LOCALE_ZH_CN = @LOCALE_ZH_CN@
+LTLIBCSTACK = @LTLIBCSTACK@
+LTLIBICONV = @LTLIBICONV@
+LTLIBINTL = @LTLIBINTL@
+LTLIBMULTITHREAD = @LTLIBMULTITHREAD@
+LTLIBOBJS = @LTLIBOBJS@
+LTLIBSIGSEGV = @LTLIBSIGSEGV@
+LTLIBTHREAD = @LTLIBTHREAD@
+MAKEINFO = @MAKEINFO@
+MKDIR_P = @MKDIR_P@
+MSGFMT = @MSGFMT@
+MSGFMT_015 = @MSGFMT_015@
+MSGMERGE = @MSGMERGE@
+NETINET_IN_H = @NETINET_IN_H@
+NEXT_ARPA_INET_H = @NEXT_ARPA_INET_H@
+NEXT_AS_FIRST_DIRECTIVE_ARPA_INET_H = @NEXT_AS_FIRST_DIRECTIVE_ARPA_INET_H@
+NEXT_AS_FIRST_DIRECTIVE_CTYPE_H = @NEXT_AS_FIRST_DIRECTIVE_CTYPE_H@
+NEXT_AS_FIRST_DIRECTIVE_DIRENT_H = @NEXT_AS_FIRST_DIRECTIVE_DIRENT_H@
+NEXT_AS_FIRST_DIRECTIVE_ERRNO_H = @NEXT_AS_FIRST_DIRECTIVE_ERRNO_H@
+NEXT_AS_FIRST_DIRECTIVE_FCNTL_H = @NEXT_AS_FIRST_DIRECTIVE_FCNTL_H@
+NEXT_AS_FIRST_DIRECTIVE_FLOAT_H = @NEXT_AS_FIRST_DIRECTIVE_FLOAT_H@
+NEXT_AS_FIRST_DIRECTIVE_FNMATCH_H = @NEXT_AS_FIRST_DIRECTIVE_FNMATCH_H@
+NEXT_AS_FIRST_DIRECTIVE_GETOPT_H = @NEXT_AS_FIRST_DIRECTIVE_GETOPT_H@
+NEXT_AS_FIRST_DIRECTIVE_ICONV_H = @NEXT_AS_FIRST_DIRECTIVE_ICONV_H@
+NEXT_AS_FIRST_DIRECTIVE_INTTYPES_H = @NEXT_AS_FIRST_DIRECTIVE_INTTYPES_H@
+NEXT_AS_FIRST_DIRECTIVE_LANGINFO_H = @NEXT_AS_FIRST_DIRECTIVE_LANGINFO_H@
+NEXT_AS_FIRST_DIRECTIVE_LIMITS_H = @NEXT_AS_FIRST_DIRECTIVE_LIMITS_H@
+NEXT_AS_FIRST_DIRECTIVE_LOCALE_H = @NEXT_AS_FIRST_DIRECTIVE_LOCALE_H@
+NEXT_AS_FIRST_DIRECTIVE_NETINET_IN_H = @NEXT_AS_FIRST_DIRECTIVE_NETINET_IN_H@
+NEXT_AS_FIRST_DIRECTIVE_PTHREAD_H = @NEXT_AS_FIRST_DIRECTIVE_PTHREAD_H@
+NEXT_AS_FIRST_DIRECTIVE_SCHED_H = @NEXT_AS_FIRST_DIRECTIVE_SCHED_H@
+NEXT_AS_FIRST_DIRECTIVE_SIGNAL_H = @NEXT_AS_FIRST_DIRECTIVE_SIGNAL_H@
+NEXT_AS_FIRST_DIRECTIVE_STDARG_H = @NEXT_AS_FIRST_DIRECTIVE_STDARG_H@
+NEXT_AS_FIRST_DIRECTIVE_STDDEF_H = @NEXT_AS_FIRST_DIRECTIVE_STDDEF_H@
+NEXT_AS_FIRST_DIRECTIVE_STDINT_H = @NEXT_AS_FIRST_DIRECTIVE_STDINT_H@
+NEXT_AS_FIRST_DIRECTIVE_STDIO_H = @NEXT_AS_FIRST_DIRECTIVE_STDIO_H@
+NEXT_AS_FIRST_DIRECTIVE_STDLIB_H = @NEXT_AS_FIRST_DIRECTIVE_STDLIB_H@
+NEXT_AS_FIRST_DIRECTIVE_STRING_H = @NEXT_AS_FIRST_DIRECTIVE_STRING_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_IOCTL_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_IOCTL_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_SELECT_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_SELECT_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_STAT_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_STAT_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_TIME_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_TIME_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_TYPES_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_TYPES_H@
+NEXT_AS_FIRST_DIRECTIVE_SYS_UIO_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_UIO_H@
+NEXT_AS_FIRST_DIRECTIVE_TIME_H = @NEXT_AS_FIRST_DIRECTIVE_TIME_H@
+NEXT_AS_FIRST_DIRECTIVE_UNISTD_H = @NEXT_AS_FIRST_DIRECTIVE_UNISTD_H@
+NEXT_AS_FIRST_DIRECTIVE_WCHAR_H = @NEXT_AS_FIRST_DIRECTIVE_WCHAR_H@
+NEXT_AS_FIRST_DIRECTIVE_WCTYPE_H = @NEXT_AS_FIRST_DIRECTIVE_WCTYPE_H@
+NEXT_CTYPE_H = @NEXT_CTYPE_H@
+NEXT_DIRENT_H = @NEXT_DIRENT_H@
+NEXT_ERRNO_H = @NEXT_ERRNO_H@
+NEXT_FCNTL_H = @NEXT_FCNTL_H@
+NEXT_FLOAT_H = @NEXT_FLOAT_H@
+NEXT_FNMATCH_H = @NEXT_FNMATCH_H@
+NEXT_GETOPT_H = @NEXT_GETOPT_H@
+NEXT_ICONV_H = @NEXT_ICONV_H@
+NEXT_INTTYPES_H = @NEXT_INTTYPES_H@
+NEXT_LANGINFO_H = @NEXT_LANGINFO_H@
+NEXT_LIMITS_H = @NEXT_LIMITS_H@
+NEXT_LOCALE_H = @NEXT_LOCALE_H@
+NEXT_NETINET_IN_H = @NEXT_NETINET_IN_H@
+NEXT_PTHREAD_H = @NEXT_PTHREAD_H@
+NEXT_SCHED_H = @NEXT_SCHED_H@
+NEXT_SIGNAL_H = @NEXT_SIGNAL_H@
+NEXT_STDARG_H = @NEXT_STDARG_H@
+NEXT_STDDEF_H = @NEXT_STDDEF_H@
+NEXT_STDINT_H = @NEXT_STDINT_H@
+NEXT_STDIO_H = @NEXT_STDIO_H@
+NEXT_STDLIB_H = @NEXT_STDLIB_H@
+NEXT_STRING_H = @NEXT_STRING_H@
+NEXT_SYS_IOCTL_H = @NEXT_SYS_IOCTL_H@
+NEXT_SYS_SELECT_H = @NEXT_SYS_SELECT_H@
+NEXT_SYS_SOCKET_H = @NEXT_SYS_SOCKET_H@
+NEXT_SYS_STAT_H = @NEXT_SYS_STAT_H@
+NEXT_SYS_TIME_H = @NEXT_SYS_TIME_H@
+NEXT_SYS_TYPES_H = @NEXT_SYS_TYPES_H@
+NEXT_SYS_UIO_H = @NEXT_SYS_UIO_H@
+NEXT_TIME_H = @NEXT_TIME_H@
+NEXT_UNISTD_H = @NEXT_UNISTD_H@
+NEXT_WCHAR_H = @NEXT_WCHAR_H@
+NEXT_WCTYPE_H = @NEXT_WCTYPE_H@
+OBJEXT = @OBJEXT@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PCRE_CFLAGS = @PCRE_CFLAGS@
+PCRE_LIBS = @PCRE_LIBS@
+PERL = @PERL@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+POSUB = @POSUB@
+PRAGMA_COLUMNS = @PRAGMA_COLUMNS@
+PRAGMA_SYSTEM_HEADER = @PRAGMA_SYSTEM_HEADER@
+PRIPTR_PREFIX = @PRIPTR_PREFIX@
+PTHREAD_H_DEFINES_STRUCT_TIMESPEC = @PTHREAD_H_DEFINES_STRUCT_TIMESPEC@
+PTRDIFF_T_SUFFIX = @PTRDIFF_T_SUFFIX@
+RANLIB = @RANLIB@
+REPLACE_ACCESS = @REPLACE_ACCESS@
+REPLACE_ALIGNED_ALLOC = @REPLACE_ALIGNED_ALLOC@
+REPLACE_BTOWC = @REPLACE_BTOWC@
+REPLACE_CALLOC = @REPLACE_CALLOC@
+REPLACE_CANONICALIZE_FILE_NAME = @REPLACE_CANONICALIZE_FILE_NAME@
+REPLACE_CHOWN = @REPLACE_CHOWN@
+REPLACE_CLOSE = @REPLACE_CLOSE@
+REPLACE_CLOSEDIR = @REPLACE_CLOSEDIR@
+REPLACE_CREAT = @REPLACE_CREAT@
+REPLACE_CTIME = @REPLACE_CTIME@
+REPLACE_DIRFD = @REPLACE_DIRFD@
+REPLACE_DPRINTF = @REPLACE_DPRINTF@
+REPLACE_DUP = @REPLACE_DUP@
+REPLACE_DUP2 = @REPLACE_DUP2@
+REPLACE_DUPLOCALE = @REPLACE_DUPLOCALE@
+REPLACE_EXECL = @REPLACE_EXECL@
+REPLACE_EXECLE = @REPLACE_EXECLE@
+REPLACE_EXECLP = @REPLACE_EXECLP@
+REPLACE_EXECV = @REPLACE_EXECV@
+REPLACE_EXECVE = @REPLACE_EXECVE@
+REPLACE_EXECVP = @REPLACE_EXECVP@
+REPLACE_EXECVPE = @REPLACE_EXECVPE@
+REPLACE_FACCESSAT = @REPLACE_FACCESSAT@
+REPLACE_FCHMODAT = @REPLACE_FCHMODAT@
+REPLACE_FCHOWNAT = @REPLACE_FCHOWNAT@
+REPLACE_FCLOSE = @REPLACE_FCLOSE@
+REPLACE_FCNTL = @REPLACE_FCNTL@
+REPLACE_FDOPEN = @REPLACE_FDOPEN@
+REPLACE_FDOPENDIR = @REPLACE_FDOPENDIR@
+REPLACE_FFLUSH = @REPLACE_FFLUSH@
+REPLACE_FFSLL = @REPLACE_FFSLL@
+REPLACE_FNMATCH = @REPLACE_FNMATCH@
+REPLACE_FOPEN = @REPLACE_FOPEN@
+REPLACE_FPRINTF = @REPLACE_FPRINTF@
+REPLACE_FPURGE = @REPLACE_FPURGE@
+REPLACE_FREE = @REPLACE_FREE@
+REPLACE_FREELOCALE = @REPLACE_FREELOCALE@
+REPLACE_FREOPEN = @REPLACE_FREOPEN@
+REPLACE_FSEEK = @REPLACE_FSEEK@
+REPLACE_FSEEKO = @REPLACE_FSEEKO@
+REPLACE_FSTAT = @REPLACE_FSTAT@
+REPLACE_FSTATAT = @REPLACE_FSTATAT@
+REPLACE_FTELL = @REPLACE_FTELL@
+REPLACE_FTELLO = @REPLACE_FTELLO@
+REPLACE_FTRUNCATE = @REPLACE_FTRUNCATE@
+REPLACE_FUTIMENS = @REPLACE_FUTIMENS@
+REPLACE_GETCWD = @REPLACE_GETCWD@
+REPLACE_GETDELIM = @REPLACE_GETDELIM@
+REPLACE_GETDOMAINNAME = @REPLACE_GETDOMAINNAME@
+REPLACE_GETDTABLESIZE = @REPLACE_GETDTABLESIZE@
+REPLACE_GETGROUPS = @REPLACE_GETGROUPS@
+REPLACE_GETLINE = @REPLACE_GETLINE@
+REPLACE_GETLOGIN_R = @REPLACE_GETLOGIN_R@
+REPLACE_GETPAGESIZE = @REPLACE_GETPAGESIZE@
+REPLACE_GETPASS = @REPLACE_GETPASS@
+REPLACE_GETTIMEOFDAY = @REPLACE_GETTIMEOFDAY@
+REPLACE_GMTIME = @REPLACE_GMTIME@
+REPLACE_ICONV = @REPLACE_ICONV@
+REPLACE_ICONV_OPEN = @REPLACE_ICONV_OPEN@
+REPLACE_ICONV_UTF = @REPLACE_ICONV_UTF@
+REPLACE_INET_NTOP = @REPLACE_INET_NTOP@
+REPLACE_INET_PTON = @REPLACE_INET_PTON@
+REPLACE_INITSTATE = @REPLACE_INITSTATE@
+REPLACE_IOCTL = @REPLACE_IOCTL@
+REPLACE_ISATTY = @REPLACE_ISATTY@
+REPLACE_ISWBLANK = @REPLACE_ISWBLANK@
+REPLACE_ISWCNTRL = @REPLACE_ISWCNTRL@
+REPLACE_ISWDIGIT = @REPLACE_ISWDIGIT@
+REPLACE_ISWXDIGIT = @REPLACE_ISWXDIGIT@
+REPLACE_ITOLD = @REPLACE_ITOLD@
+REPLACE_LCHOWN = @REPLACE_LCHOWN@
+REPLACE_LINK = @REPLACE_LINK@
+REPLACE_LINKAT = @REPLACE_LINKAT@
+REPLACE_LOCALECONV = @REPLACE_LOCALECONV@
+REPLACE_LOCALTIME = @REPLACE_LOCALTIME@
+REPLACE_LOCALTIME_R = @REPLACE_LOCALTIME_R@
+REPLACE_LSEEK = @REPLACE_LSEEK@
+REPLACE_LSTAT = @REPLACE_LSTAT@
+REPLACE_MALLOC = @REPLACE_MALLOC@
+REPLACE_MBRLEN = @REPLACE_MBRLEN@
+REPLACE_MBRTOWC = @REPLACE_MBRTOWC@
+REPLACE_MBSINIT = @REPLACE_MBSINIT@
+REPLACE_MBSNRTOWCS = @REPLACE_MBSNRTOWCS@
+REPLACE_MBSRTOWCS = @REPLACE_MBSRTOWCS@
+REPLACE_MBSTATE_T = @REPLACE_MBSTATE_T@
+REPLACE_MBTOWC = @REPLACE_MBTOWC@
+REPLACE_MEMCHR = @REPLACE_MEMCHR@
+REPLACE_MEMMEM = @REPLACE_MEMMEM@
+REPLACE_MKDIR = @REPLACE_MKDIR@
+REPLACE_MKFIFO = @REPLACE_MKFIFO@
+REPLACE_MKFIFOAT = @REPLACE_MKFIFOAT@
+REPLACE_MKNOD = @REPLACE_MKNOD@
+REPLACE_MKNODAT = @REPLACE_MKNODAT@
+REPLACE_MKSTEMP = @REPLACE_MKSTEMP@
+REPLACE_MKTIME = @REPLACE_MKTIME@
+REPLACE_NANOSLEEP = @REPLACE_NANOSLEEP@
+REPLACE_NEWLOCALE = @REPLACE_NEWLOCALE@
+REPLACE_NL_LANGINFO = @REPLACE_NL_LANGINFO@
+REPLACE_NULL = @REPLACE_NULL@
+REPLACE_OBSTACK_PRINTF = @REPLACE_OBSTACK_PRINTF@
+REPLACE_OPEN = @REPLACE_OPEN@
+REPLACE_OPENAT = @REPLACE_OPENAT@
+REPLACE_OPENDIR = @REPLACE_OPENDIR@
+REPLACE_PERROR = @REPLACE_PERROR@
+REPLACE_POPEN = @REPLACE_POPEN@
+REPLACE_POSIX_MEMALIGN = @REPLACE_POSIX_MEMALIGN@
+REPLACE_PREAD = @REPLACE_PREAD@
+REPLACE_PRINTF = @REPLACE_PRINTF@
+REPLACE_PSELECT = @REPLACE_PSELECT@
+REPLACE_PTHREAD_ATTR_DESTROY = @REPLACE_PTHREAD_ATTR_DESTROY@
+REPLACE_PTHREAD_ATTR_GETDETACHSTATE = @REPLACE_PTHREAD_ATTR_GETDETACHSTATE@
+REPLACE_PTHREAD_ATTR_INIT = @REPLACE_PTHREAD_ATTR_INIT@
+REPLACE_PTHREAD_ATTR_SETDETACHSTATE = @REPLACE_PTHREAD_ATTR_SETDETACHSTATE@
+REPLACE_PTHREAD_CONDATTR_DESTROY = @REPLACE_PTHREAD_CONDATTR_DESTROY@
+REPLACE_PTHREAD_CONDATTR_INIT = @REPLACE_PTHREAD_CONDATTR_INIT@
+REPLACE_PTHREAD_COND_BROADCAST = @REPLACE_PTHREAD_COND_BROADCAST@
+REPLACE_PTHREAD_COND_DESTROY = @REPLACE_PTHREAD_COND_DESTROY@
+REPLACE_PTHREAD_COND_INIT = @REPLACE_PTHREAD_COND_INIT@
+REPLACE_PTHREAD_COND_SIGNAL = @REPLACE_PTHREAD_COND_SIGNAL@
+REPLACE_PTHREAD_COND_TIMEDWAIT = @REPLACE_PTHREAD_COND_TIMEDWAIT@
+REPLACE_PTHREAD_COND_WAIT = @REPLACE_PTHREAD_COND_WAIT@
+REPLACE_PTHREAD_CREATE = @REPLACE_PTHREAD_CREATE@
+REPLACE_PTHREAD_DETACH = @REPLACE_PTHREAD_DETACH@
+REPLACE_PTHREAD_EQUAL = @REPLACE_PTHREAD_EQUAL@
+REPLACE_PTHREAD_EXIT = @REPLACE_PTHREAD_EXIT@
+REPLACE_PTHREAD_GETSPECIFIC = @REPLACE_PTHREAD_GETSPECIFIC@
+REPLACE_PTHREAD_JOIN = @REPLACE_PTHREAD_JOIN@
+REPLACE_PTHREAD_KEY_CREATE = @REPLACE_PTHREAD_KEY_CREATE@
+REPLACE_PTHREAD_KEY_DELETE = @REPLACE_PTHREAD_KEY_DELETE@
+REPLACE_PTHREAD_MUTEXATTR_DESTROY = @REPLACE_PTHREAD_MUTEXATTR_DESTROY@
+REPLACE_PTHREAD_MUTEXATTR_GETROBUST = @REPLACE_PTHREAD_MUTEXATTR_GETROBUST@
+REPLACE_PTHREAD_MUTEXATTR_GETTYPE = @REPLACE_PTHREAD_MUTEXATTR_GETTYPE@
+REPLACE_PTHREAD_MUTEXATTR_INIT = @REPLACE_PTHREAD_MUTEXATTR_INIT@
+REPLACE_PTHREAD_MUTEXATTR_SETROBUST = @REPLACE_PTHREAD_MUTEXATTR_SETROBUST@
+REPLACE_PTHREAD_MUTEXATTR_SETTYPE = @REPLACE_PTHREAD_MUTEXATTR_SETTYPE@
+REPLACE_PTHREAD_MUTEX_DESTROY = @REPLACE_PTHREAD_MUTEX_DESTROY@
+REPLACE_PTHREAD_MUTEX_INIT = @REPLACE_PTHREAD_MUTEX_INIT@
+REPLACE_PTHREAD_MUTEX_LOCK = @REPLACE_PTHREAD_MUTEX_LOCK@
+REPLACE_PTHREAD_MUTEX_TIMEDLOCK = @REPLACE_PTHREAD_MUTEX_TIMEDLOCK@
+REPLACE_PTHREAD_MUTEX_TRYLOCK = @REPLACE_PTHREAD_MUTEX_TRYLOCK@
+REPLACE_PTHREAD_MUTEX_UNLOCK = @REPLACE_PTHREAD_MUTEX_UNLOCK@
+REPLACE_PTHREAD_ONCE = @REPLACE_PTHREAD_ONCE@
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+grep_TEXINFOS = fdl.texi
+man_MANS = grep.1 fgrep.1 egrep.1
+EXTRA_DIST = grep.in.1
+CLEANFILES = grep.1 egrep.1 fgrep.1
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .dvi .html .info .pdf .ps .texi
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu doc/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu doc/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
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+.texi.info:
+	$(AM_V_MAKEINFO)restore=: && backupdir="$(am__leading_dot)am$$$$" && \
+	am__cwd=`pwd` && $(am__cd) $(srcdir) && \
+	rm -rf $$backupdir && mkdir $$backupdir && \
+	if ($(MAKEINFO) --version) >/dev/null 2>&1; then \
+	  for f in $@ $@-[0-9] $@-[0-9][0-9] $(@:.info=).i[0-9] $(@:.info=).i[0-9][0-9]; do \
+	    if test -f $$f; then mv $$f $$backupdir; restore=mv; else :; fi; \
+	  done; \
+	else :; fi && \
+	cd "$$am__cwd"; \
+	if $(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I $(srcdir) \
+	 -o $@ $<; \
+	then \
+	  rc=0; \
+	  $(am__cd) $(srcdir); \
+	else \
+	  rc=$$?; \
+	  $(am__cd) $(srcdir) && \
+	  $$restore $$backupdir/* `echo "./$@" | sed 's|[^/]*$$||'`; \
+	fi; \
+	rm -rf $$backupdir; exit $$rc
+
+.texi.dvi:
+	$(AM_V_TEXI2DVI)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	MAKEINFO='$(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I $(srcdir)' \
+	$(TEXI2DVI) $(AM_V_texinfo) --build-dir=$(@:.dvi=.t2d) -o $@ $(AM_V_texidevnull) \
+	$<
+
+.texi.pdf:
+	$(AM_V_TEXI2PDF)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	MAKEINFO='$(MAKEINFO) $(AM_MAKEINFOFLAGS) $(MAKEINFOFLAGS) -I $(srcdir)' \
+	$(TEXI2PDF) $(AM_V_texinfo) --build-dir=$(@:.pdf=.t2p) -o $@ $(AM_V_texidevnull) \
+	$<
+
+.texi.html:
+	$(AM_V_MAKEINFO)rm -rf $(@:.html=.htp)
+	$(AM_V_at)if $(MAKEINFOHTML) $(AM_MAKEINFOHTMLFLAGS) $(MAKEINFOFLAGS) -I $(srcdir) \
+	 -o $(@:.html=.htp) $<; \
+	then \
+	  rm -rf $@ && mv $(@:.html=.htp) $@; \
+	else \
+	  rm -rf $(@:.html=.htp); exit 1; \
+	fi
+$(srcdir)/grep.info: grep.texi $(srcdir)/version.texi $(grep_TEXINFOS)
+grep.dvi: grep.texi $(srcdir)/version.texi $(grep_TEXINFOS)
+grep.pdf: grep.texi $(srcdir)/version.texi $(grep_TEXINFOS)
+grep.html: grep.texi $(srcdir)/version.texi $(grep_TEXINFOS)
+$(srcdir)/version.texi:  $(srcdir)/stamp-vti
+$(srcdir)/stamp-vti: grep.texi $(top_srcdir)/configure
+	@(dir=.; test -f ./grep.texi || dir=$(srcdir); \
+	set `$(SHELL) $(top_srcdir)/build-aux/mdate-sh $$dir/grep.texi`; \
+	echo "@set UPDATED $$1 $$2 $$3"; \
+	echo "@set UPDATED-MONTH $$2 $$3"; \
+	echo "@set EDITION $(VERSION)"; \
+	echo "@set VERSION $(VERSION)") > vti.tmp$$$$ && \
+	(cmp -s vti.tmp$$$$ $(srcdir)/version.texi \
+	  || (echo "Updating $(srcdir)/version.texi" && \
+	      cp vti.tmp$$$$ $(srcdir)/version.texi.tmp$$$$ && \
+	      mv $(srcdir)/version.texi.tmp$$$$ $(srcdir)/version.texi)) && \
+	rm -f vti.tmp$$$$ $(srcdir)/version.texi.$$$$
+	@cp $(srcdir)/version.texi $@
+
+mostlyclean-vti:
+	-rm -f vti.tmp* $(srcdir)/version.texi.tmp*
+
+maintainer-clean-vti:
+	-rm -f $(srcdir)/stamp-vti $(srcdir)/version.texi
+.dvi.ps:
+	$(AM_V_DVIPS)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
+	$(DVIPS) $(AM_V_texinfo) -o $@ $<
+
+uninstall-dvi-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(DVIS)'; test -n "$(dvidir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(dvidir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(dvidir)/$$f"; \
+	done
+
+uninstall-html-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(HTMLS)'; test -n "$(htmldir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -rf '$(DESTDIR)$(htmldir)/$$f'"; \
+	  rm -rf "$(DESTDIR)$(htmldir)/$$f"; \
+	done
+
+uninstall-info-am:
+	@$(PRE_UNINSTALL)
+	@if test -d '$(DESTDIR)$(infodir)' && $(am__can_run_installinfo); then \
+	  list='$(INFO_DEPS)'; \
+	  for file in $$list; do \
+	    relfile=`echo "$$file" | sed 's|^.*/||'`; \
+	    echo " install-info --info-dir='$(DESTDIR)$(infodir)' --remove '$(DESTDIR)$(infodir)/$$relfile'"; \
+	    if install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$$relfile"; \
+	    then :; else test ! -f "$(DESTDIR)$(infodir)/$$relfile" || exit 1; fi; \
+	  done; \
+	else :; fi
+	@$(NORMAL_UNINSTALL)
+	@list='$(INFO_DEPS)'; \
+	for file in $$list; do \
+	  relfile=`echo "$$file" | sed 's|^.*/||'`; \
+	  relfile_i=`echo "$$relfile" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  (if test -d "$(DESTDIR)$(infodir)" && cd "$(DESTDIR)$(infodir)"; then \
+	     echo " cd '$(DESTDIR)$(infodir)' && rm -f $$relfile $$relfile-[0-9] $$relfile-[0-9][0-9] $$relfile_i[0-9] $$relfile_i[0-9][0-9]"; \
+	     rm -f $$relfile $$relfile-[0-9] $$relfile-[0-9][0-9] $$relfile_i[0-9] $$relfile_i[0-9][0-9]; \
+	   else :; fi); \
+	done
+
+uninstall-pdf-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(PDFS)'; test -n "$(pdfdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(pdfdir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(pdfdir)/$$f"; \
+	done
+
+uninstall-ps-am:
+	@$(NORMAL_UNINSTALL)
+	@list='$(PSS)'; test -n "$(psdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " rm -f '$(DESTDIR)$(psdir)/$$f'"; \
+	  rm -f "$(DESTDIR)$(psdir)/$$f"; \
+	done
+
+dist-info: $(INFO_DEPS)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; \
+	list='$(INFO_DEPS)'; \
+	for base in $$list; do \
+	  case $$base in \
+	    $(srcdir)/*) base=`echo "$$base" | sed "s|^$$srcdirstrip/||"`;; \
+	  esac; \
+	  if test -f $$base; then d=.; else d=$(srcdir); fi; \
+	  base_i=`echo "$$base" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  for file in $$d/$$base $$d/$$base-[0-9] $$d/$$base-[0-9][0-9] $$d/$$base_i[0-9] $$d/$$base_i[0-9][0-9]; do \
+	    if test -f $$file; then \
+	      relfile=`expr "$$file" : "$$d/\(.*\)"`; \
+	      test -f "$(distdir)/$$relfile" || \
+		cp -p $$file "$(distdir)/$$relfile"; \
+	    else :; fi; \
+	  done; \
+	done
+
+mostlyclean-aminfo:
+	-rm -rf grep.t2d grep.t2p
+
+clean-aminfo:
+	-test -z "grep.dvi grep.pdf grep.ps grep.html" \
+	|| rm -rf grep.dvi grep.pdf grep.ps grep.html
+
+maintainer-clean-aminfo:
+	@list='$(INFO_DEPS)'; for i in $$list; do \
+	  i_i=`echo "$$i" | sed 's|\.info$$||;s|$$|.i|'`; \
+	  echo " rm -f $$i $$i-[0-9] $$i-[0-9][0-9] $$i_i[0-9] $$i_i[0-9][0-9]"; \
+	  rm -f $$i $$i-[0-9] $$i-[0-9][0-9] $$i_i[0-9] $$i_i[0-9][0-9]; \
+	done
+install-man1: $(man_MANS)
+	@$(NORMAL_INSTALL)
+	@list1=''; \
+	list2='$(man_MANS)'; \
+	test -n "$(man1dir)" \
+	  && test -n "`echo $$list1$$list2`" \
+	  || exit 0; \
+	echo " $(MKDIR_P) '$(DESTDIR)$(man1dir)'"; \
+	$(MKDIR_P) "$(DESTDIR)$(man1dir)" || exit 1; \
+	{ for i in $$list1; do echo "$$i"; done;  \
+	if test -n "$$list2"; then \
+	  for i in $$list2; do echo "$$i"; done \
+	    | sed -n '/\.1[a-z]*$$/p'; \
+	fi; \
+	} | while read p; do \
+	  if test -f $$p; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; echo "$$p"; \
+	done | \
+	sed -e 'n;s,.*/,,;p;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,' | \
+	sed 'N;N;s,\n, ,g' | { \
+	list=; while read file base inst; do \
+	  if test "$$base" = "$$inst"; then list="$$list $$file"; else \
+	    echo " $(INSTALL_DATA) '$$file' '$(DESTDIR)$(man1dir)/$$inst'"; \
+	    $(INSTALL_DATA) "$$file" "$(DESTDIR)$(man1dir)/$$inst" || exit $$?; \
+	  fi; \
+	done; \
+	for i in $$list; do echo "$$i"; done | $(am__base_list) | \
+	while read files; do \
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+	} | sed -e 's,.*/,,;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
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+
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
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+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	  if test -f "$$p" || test -d "$$p"; then d=; else d="$(srcdir)/"; fi; \
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+	    $(MKDIR_P) "$(DESTDIR)$(htmldir)/$$f" || exit 1; \
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+	    $(srcdir)/*) file=`echo "$$file" | sed "s|^$$srcdirstrip/||"`;; \
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+	while read files; do \
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+
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+
+.PHONY: all all-am check check-am clean clean-aminfo clean-generic \
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+.PRECIOUS: Makefile
+
+
+grep.1: grep.in.1
+	$(AM_V_GEN)rm -f $@-t $@
+	$(AM_V_at)sed 's/@''VERSION@/$(VERSION)/' $(srcdir)/grep.in.1 > $@-t
+	$(AM_V_at)chmod a=r $@-t
+	$(AM_V_at)mv -f $@-t $@
+
+egrep.1 fgrep.1: Makefile.am
+	$(AM_V_GEN)rm -f $@-t $@
+	$(AM_V_at)inst=`echo grep | sed '$(transform)'`.1 \
+	  && echo ".so man1/$$inst" > $@-t
+	$(AM_V_at)chmod a=r $@-t
+	$(AM_V_at)mv -f $@-t $@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/grep/doc/fdl.texi b/src/grep/doc/fdl.texi
new file mode 100644
index 0000000..eaf3da0
--- /dev/null
+++ b/src/grep/doc/fdl.texi
@@ -0,0 +1,505 @@
+@c The GNU Free Documentation License.
+@center Version 1.3, 3 November 2008
+
+@c This file is intended to be included within another document,
+@c hence no sectioning command or @node.
+
+@display
+Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
+@uref{https://fsf.org/}
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+@end display
+
+@enumerate 0
+@item
+PREAMBLE
+
+The purpose of this License is to make a manual, textbook, or other
+functional and useful document @dfn{free} in the sense of freedom: to
+assure everyone the effective freedom to copy and redistribute it,
+with or without modifying it, either commercially or noncommercially.
+Secondarily, this License preserves for the author and publisher a way
+to get credit for their work, while not being considered responsible
+for modifications made by others.
+
+This License is a kind of ``copyleft'', which means that derivative
+works of the document must themselves be free in the same sense.  It
+complements the GNU General Public License, which is a copyleft
+license designed for free software.
+
+We have designed this License in order to use it for manuals for free
+software, because free software needs free documentation: a free
+program should come with manuals providing the same freedoms that the
+software does.  But this License is not limited to software manuals;
+it can be used for any textual work, regardless of subject matter or
+whether it is published as a printed book.  We recommend this License
+principally for works whose purpose is instruction or reference.
+
+@item
+APPLICABILITY AND DEFINITIONS
+
+This License applies to any manual or other work, in any medium, that
+contains a notice placed by the copyright holder saying it can be
+distributed under the terms of this License.  Such a notice grants a
+world-wide, royalty-free license, unlimited in duration, to use that
+work under the conditions stated herein.  The ``Document'', below,
+refers to any such manual or work.  Any member of the public is a
+licensee, and is addressed as ``you''.  You accept the license if you
+copy, modify or distribute the work in a way requiring permission
+under copyright law.
+
+A ``Modified Version'' of the Document means any work containing the
+Document or a portion of it, either copied verbatim, or with
+modifications and/or translated into another language.
+
+A ``Secondary Section'' is a named appendix or a front-matter section
+of the Document that deals exclusively with the relationship of the
+publishers or authors of the Document to the Document's overall
+subject (or to related matters) and contains nothing that could fall
+directly within that overall subject.  (Thus, if the Document is in
+part a textbook of mathematics, a Secondary Section may not explain
+any mathematics.)  The relationship could be a matter of historical
+connection with the subject or with related matters, or of legal,
+commercial, philosophical, ethical or political position regarding
+them.
+
+The ``Invariant Sections'' are certain Secondary Sections whose titles
+are designated, as being those of Invariant Sections, in the notice
+that says that the Document is released under this License.  If a
+section does not fit the above definition of Secondary then it is not
+allowed to be designated as Invariant.  The Document may contain zero
+Invariant Sections.  If the Document does not identify any Invariant
+Sections then there are none.
+
+The ``Cover Texts'' are certain short passages of text that are listed,
+as Front-Cover Texts or Back-Cover Texts, in the notice that says that
+the Document is released under this License.  A Front-Cover Text may
+be at most 5 words, and a Back-Cover Text may be at most 25 words.
+
+A ``Transparent'' copy of the Document means a machine-readable copy,
+represented in a format whose specification is available to the
+general public, that is suitable for revising the document
+straightforwardly with generic text editors or (for images composed of
+pixels) generic paint programs or (for drawings) some widely available
+drawing editor, and that is suitable for input to text formatters or
+for automatic translation to a variety of formats suitable for input
+to text formatters.  A copy made in an otherwise Transparent file
+format whose markup, or absence of markup, has been arranged to thwart
+or discourage subsequent modification by readers is not Transparent.
+An image format is not Transparent if used for any substantial amount
+of text.  A copy that is not ``Transparent'' is called ``Opaque''.
+
+Examples of suitable formats for Transparent copies include plain
+ASCII without markup, Texinfo input format, La@TeX{} input
+format, SGML or XML using a publicly available
+DTD, and standard-conforming simple HTML,
+PostScript or PDF designed for human modification.  Examples
+of transparent image formats include PNG, XCF and
+JPG@.  Opaque formats include proprietary formats that can be
+read and edited only by proprietary word processors, SGML or
+XML for which the DTD and/or processing tools are
+not generally available, and the machine-generated HTML,
+PostScript or PDF produced by some word processors for
+output purposes only.
+
+The ``Title Page'' means, for a printed book, the title page itself,
+plus such following pages as are needed to hold, legibly, the material
+this License requires to appear in the title page.  For works in
+formats which do not have any title page as such, ``Title Page'' means
+the text near the most prominent appearance of the work's title,
+preceding the beginning of the body of the text.
+
+The ``publisher'' means any person or entity that distributes copies
+of the Document to the public.
+
+A section ``Entitled XYZ'' means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
+text that translates XYZ in another language.  (Here XYZ stands for a
+specific section name mentioned below, such as ``Acknowledgements'',
+``Dedications'', ``Endorsements'', or ``History''.)  To ``Preserve the Title''
+of such a section when you modify the Document means that it remains a
+section ``Entitled XYZ'' according to this definition.
+
+The Document may include Warranty Disclaimers next to the notice which
+states that this License applies to the Document.  These Warranty
+Disclaimers are considered to be included by reference in this
+License, but only as regards disclaiming warranties: any other
+implication that these Warranty Disclaimers may have is void and has
+no effect on the meaning of this License.
+
+@item
+VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies
+to the Document are reproduced in all copies, and that you add no other
+conditions whatsoever to those of this License.  You may not use
+technical measures to obstruct or control the reading or further
+copying of the copies you make or distribute.  However, you may accept
+compensation in exchange for copies.  If you distribute a large enough
+number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+@item
+COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have
+printed covers) of the Document, numbering more than 100, and the
+Document's license notice requires Cover Texts, you must enclose the
+copies in covers that carry, clearly and legibly, all these Cover
+Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
+the back cover.  Both covers must also clearly and legibly identify
+you as the publisher of these copies.  The front cover must present
+the full title with all words of the title equally prominent and
+visible.  You may add other material on the covers in addition.
+Copying with changes limited to the covers, as long as they preserve
+the title of the Document and satisfy these conditions, can be treated
+as verbatim copying in other respects.
+
+If the required texts for either cover are too voluminous to fit
+legibly, you should put the first ones listed (as many as fit
+reasonably) on the actual cover, and continue the rest onto adjacent
+pages.
+
+If you publish or distribute Opaque copies of the Document numbering
+more than 100, you must either include a machine-readable Transparent
+copy along with each Opaque copy, or state in or with each Opaque copy
+a computer-network location from which the general network-using
+public has access to download using public-standard network protocols
+a complete Transparent copy of the Document, free of added material.
+If you use the latter option, you must take reasonably prudent steps,
+when you begin distribution of Opaque copies in quantity, to ensure
+that this Transparent copy will remain thus accessible at the stated
+location until at least one year after the last time you distribute an
+Opaque copy (directly or through your agents or retailers) of that
+edition to the public.
+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to give
+them a chance to provide you with an updated version of the Document.
+
+@item
+MODIFICATIONS
+
+You may copy and distribute a Modified Version of the Document under
+the conditions of sections 2 and 3 above, provided that you release
+the Modified Version under precisely this License, with the Modified
+Version filling the role of the Document, thus licensing distribution
+and modification of the Modified Version to whoever possesses a copy
+of it.  In addition, you must do these things in the Modified Version:
+
+@enumerate A
+@item
+Use in the Title Page (and on the covers, if any) a title distinct
+from that of the Document, and from those of previous versions
+(which should, if there were any, be listed in the History section
+of the Document).  You may use the same title as a previous version
+if the original publisher of that version gives permission.
+
+@item
+List on the Title Page, as authors, one or more persons or entities
+responsible for authorship of the modifications in the Modified
+Version, together with at least five of the principal authors of the
+Document (all of its principal authors, if it has fewer than five),
+unless they release you from this requirement.
+
+@item
+State on the Title page the name of the publisher of the
+Modified Version, as the publisher.
+
+@item
+Preserve all the copyright notices of the Document.
+
+@item
+Add an appropriate copyright notice for your modifications
+adjacent to the other copyright notices.
+
+@item
+Include, immediately after the copyright notices, a license notice
+giving the public permission to use the Modified Version under the
+terms of this License, in the form shown in the Addendum below.
+
+@item
+Preserve in that license notice the full lists of Invariant Sections
+and required Cover Texts given in the Document's license notice.
+
+@item
+Include an unaltered copy of this License.
+
+@item
+Preserve the section Entitled ``History'', Preserve its Title, and add
+to it an item stating at least the title, year, new authors, and
+publisher of the Modified Version as given on the Title Page.  If
+there is no section Entitled ``History'' in the Document, create one
+stating the title, year, authors, and publisher of the Document as
+given on its Title Page, then add an item describing the Modified
+Version as stated in the previous sentence.
+
+@item
+Preserve the network location, if any, given in the Document for
+public access to a Transparent copy of the Document, and likewise
+the network locations given in the Document for previous versions
+it was based on.  These may be placed in the ``History'' section.
+You may omit a network location for a work that was published at
+least four years before the Document itself, or if the original
+publisher of the version it refers to gives permission.
+
+@item
+For any section Entitled ``Acknowledgements'' or ``Dedications'', Preserve
+the Title of the section, and preserve in the section all the
+substance and tone of each of the contributor acknowledgements and/or
+dedications given therein.
+
+@item
+Preserve all the Invariant Sections of the Document,
+unaltered in their text and in their titles.  Section numbers
+or the equivalent are not considered part of the section titles.
+
+@item
+Delete any section Entitled ``Endorsements''.  Such a section
+may not be included in the Modified Version.
+
+@item
+Do not retitle any existing section to be Entitled ``Endorsements'' or
+to conflict in title with any Invariant Section.
+
+@item
+Preserve any Warranty Disclaimers.
+@end enumerate
+
+If the Modified Version includes new front-matter sections or
+appendices that qualify as Secondary Sections and contain no material
+copied from the Document, you may at your option designate some or all
+of these sections as invariant.  To do this, add their titles to the
+list of Invariant Sections in the Modified Version's license notice.
+These titles must be distinct from any other section titles.
+
+You may add a section Entitled ``Endorsements'', provided it contains
+nothing but endorsements of your Modified Version by various
+parties---for example, statements of peer review or that the text has
+been approved by an organization as the authoritative definition of a
+standard.
+
+You may add a passage of up to five words as a Front-Cover Text, and a
+passage of up to 25 words as a Back-Cover Text, to the end of the list
+of Cover Texts in the Modified Version.  Only one passage of
+Front-Cover Text and one of Back-Cover Text may be added by (or
+through arrangements made by) any one entity.  If the Document already
+includes a cover text for the same cover, previously added by you or
+by arrangement made by the same entity you are acting on behalf of,
+you may not add another; but you may replace the old one, on explicit
+permission from the previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License
+give permission to use their names for publicity for or to assert or
+imply endorsement of any Modified Version.
+
+@item
+COMBINING DOCUMENTS
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
+list them all as Invariant Sections of your combined work in its
+license notice, and that you preserve all their Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and
+multiple identical Invariant Sections may be replaced with a single
+copy.  If there are multiple Invariant Sections with the same name but
+different contents, make the title of each such section unique by
+adding at the end of it, in parentheses, the name of the original
+author or publisher of that section if known, or else a unique number.
+Make the same adjustment to the section titles in the list of
+Invariant Sections in the license notice of the combined work.
+
+In the combination, you must combine any sections Entitled ``History''
+in the various original documents, forming one section Entitled
+``History''; likewise combine any sections Entitled ``Acknowledgements'',
+and any sections Entitled ``Dedications''.  You must delete all
+sections Entitled ``Endorsements.''
+
+@item
+COLLECTIONS OF DOCUMENTS
+
+You may make a collection consisting of the Document and other documents
+released under this License, and replace the individual copies of this
+License in the various documents with a single copy that is included in
+the collection, provided that you follow the rules of this License for
+verbatim copying of each of the documents in all other respects.
+
+You may extract a single document from such a collection, and distribute
+it individually under this License, provided you insert a copy of this
+License into the extracted document, and follow this License in all
+other respects regarding verbatim copying of that document.
+
+@item
+AGGREGATION WITH INDEPENDENT WORKS
+
+A compilation of the Document or its derivatives with other separate
+and independent documents or works, in or on a volume of a storage or
+distribution medium, is called an ``aggregate'' if the copyright
+resulting from the compilation is not used to limit the legal rights
+of the compilation's users beyond what the individual works permit.
+When the Document is included in an aggregate, this License does not
+apply to the other works in the aggregate which are not themselves
+derivative works of the Document.
+
+If the Cover Text requirement of section 3 is applicable to these
+copies of the Document, then if the Document is less than one half of
+the entire aggregate, the Document's Cover Texts may be placed on
+covers that bracket the Document within the aggregate, or the
+electronic equivalent of covers if the Document is in electronic form.
+Otherwise they must appear on printed covers that bracket the whole
+aggregate.
+
+@item
+TRANSLATION
+
+Translation is considered a kind of modification, so you may
+distribute translations of the Document under the terms of section 4.
+Replacing Invariant Sections with translations requires special
+permission from their copyright holders, but you may include
+translations of some or all Invariant Sections in addition to the
+original versions of these Invariant Sections.  You may include a
+translation of this License, and all the license notices in the
+Document, and any Warranty Disclaimers, provided that you also include
+the original English version of this License and the original versions
+of those notices and disclaimers.  In case of a disagreement between
+the translation and the original version of this License or a notice
+or disclaimer, the original version will prevail.
+
+If a section in the Document is Entitled ``Acknowledgements'',
+``Dedications'', or ``History'', the requirement (section 4) to Preserve
+its Title (section 1) will typically require changing the actual
+title.
+
+@item
+TERMINATION
+
+You may not copy, modify, sublicense, or distribute the Document
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense, or distribute it is void, and
+will automatically terminate your rights under this License.
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, receipt of a copy of some or all of the same material does
+not give you any rights to use it.
+
+@item
+FUTURE REVISIONS OF THIS LICENSE
+
+The Free Software Foundation may publish new, revised versions
+of the GNU Free Documentation License from time to time.  Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.  See
+@uref{https://www.gnu.org/licenses/}.
+
+Each version of the License is given a distinguishing version number.
+If the Document specifies that a particular numbered version of this
+License ``or any later version'' applies to it, you have the option of
+following the terms and conditions either of that specified version or
+of any later version that has been published (not as a draft) by the
+Free Software Foundation.  If the Document does not specify a version
+number of this License, you may choose any version ever published (not
+as a draft) by the Free Software Foundation.  If the Document
+specifies that a proxy can decide which future versions of this
+License can be used, that proxy's public statement of acceptance of a
+version permanently authorizes you to choose that version for the
+Document.
+
+@item
+RELICENSING
+
+``Massive Multiauthor Collaboration Site'' (or ``MMC Site'') means any
+World Wide Web server that publishes copyrightable works and also
+provides prominent facilities for anybody to edit those works.  A
+public wiki that anybody can edit is an example of such a server.  A
+``Massive Multiauthor Collaboration'' (or ``MMC'') contained in the
+site means any set of copyrightable works thus published on the MMC
+site.
+
+``CC-BY-SA'' means the Creative Commons Attribution-Share Alike 3.0
+license published by Creative Commons Corporation, a not-for-profit
+corporation with a principal place of business in San Francisco,
+California, as well as future copyleft versions of that license
+published by that same organization.
+
+``Incorporate'' means to publish or republish a Document, in whole or
+in part, as part of another Document.
+
+An MMC is ``eligible for relicensing'' if it is licensed under this
+License, and if all works that were first published under this License
+somewhere other than this MMC, and subsequently incorporated in whole
+or in part into the MMC, (1) had no cover texts or invariant sections,
+and (2) were thus incorporated prior to November 1, 2008.
+
+The operator of an MMC Site may republish an MMC contained in the site
+under CC-BY-SA on the same site at any time before August 1, 2009,
+provided the MMC is eligible for relicensing.
+
+@end enumerate
+
+@page
+@heading ADDENDUM: How to use this License for your documents
+
+To use this License in a document you have written, include a copy of
+the License in the document and put the following copyright and
+license notices just after the title page:
+
+@smallexample
+@group
+  Copyright (C)  @var{year}  @var{your name}.
+  Permission is granted to copy, distribute and/or modify this document
+  under the terms of the GNU Free Documentation License, Version 1.3
+  or any later version published by the Free Software Foundation;
+  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
+  Texts.  A copy of the license is included in the section entitled ``GNU
+  Free Documentation License''.
+@end group
+@end smallexample
+
+If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
+replace the ``with@dots{}Texts.''@: line with this:
+
+@smallexample
+@group
+    with the Invariant Sections being @var{list their titles}, with
+    the Front-Cover Texts being @var{list}, and with the Back-Cover Texts
+    being @var{list}.
+@end group
+@end smallexample
+
+If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+If your document contains nontrivial examples of program code, we
+recommend releasing these examples in parallel under your choice of
+free software license, such as the GNU General Public License,
+to permit their use in free software.
+
+@c Local Variables:
+@c ispell-local-pdict: "ispell-dict"
+@c End:
diff --git a/src/grep/doc/grep.in.1 b/src/grep/doc/grep.in.1
new file mode 100644
index 0000000..e8854f2
--- /dev/null
+++ b/src/grep/doc/grep.in.1
@@ -0,0 +1,1402 @@
+.\" GNU grep man page
+.de dT
+.ds Dt \\$2
+..
+.dT Time-stamp: "2019-12-29"
+.\" Update the above date whenever a change to either this file or
+.\" grep.c's 'usage' function results in a nontrivial change to the man page.
+.\" In Emacs, you can update the date by running 'M-x time-stamp'
+.\" after you make a change that you decide is nontrivial.
+.\" It is no big deal to forget to update the date.
+.
+.TH GREP 1 \*(Dt "GNU grep @VERSION@" "User Commands"
+.
+.if !\w|\*(lq| \{\
+.\" groff an-old.tmac does not seem to be in use, so define lq and rq.
+.	ie \n(.g \{\
+.		ds lq \(lq\"
+.		ds rq \(rq\"
+.	\}
+.	el \{\
+.		ds lq ``
+.		ds rq ''
+.	\}
+.\}
+.
+.if !\w|\*(la| \{\
+.\" groff an-ext.tmac does not seem to be in use, so define the parts of
+.\" it that are used below.  For a copy of groff an-ext.tmac, please see:
+.\" https://git.savannah.gnu.org/cgit/groff.git/plain/tmac/an-ext.tmac
+.\" --- Start of lines taken from groff an-ext.tmac
+.
+.\" Check whether we are using grohtml.
+.nr mH 0
+.if \n(.g \
+.  if '\*(.T'html' \
+.    nr mH 1
+.
+.
+.\" Map mono-width fonts to standard fonts for groff's TTY device.
+.if n \{\
+.  do ftr CR R
+.  do ftr CI I
+.  do ftr CB B
+.\}
+.
+.\" groff has glyph entities for angle brackets.
+.ie \n(.g \{\
+.  ds la \(la\"
+.  ds ra \(ra\"
+.\}
+.el \{\
+.  ds la <\"
+.  ds ra >\"
+.  \" groff's man macros control hyphenation with this register.
+.  nr HY 1
+.\}
+.
+.\" Start URL.
+.de UR
+.  ds m1 \\$1\"
+.  nh
+.  if \\n(mH \{\
+.    \" Start diversion in a new environment.
+.    do ev URL-div
+.    do di URL-div
+.  \}
+..
+.
+.
+.\" End URL.
+.de UE
+.  ie \\n(mH \{\
+.    br
+.    di
+.    ev
+.
+.    \" Has there been one or more input lines for the link text?
+.    ie \\n(dn \{\
+.      do HTML-NS "<a href=""\\*(m1"">"
+.      \" Yes, strip off final newline of diversion and emit it.
+.      do chop URL-div
+.      do URL-div
+\c
+.      do HTML-NS </a>
+.    \}
+.    el \
+.      do HTML-NS "<a href=""\\*(m1"">\\*(m1</a>"
+\&\\$*\"
+.  \}
+.  el \
+\\*(la\\*(m1\\*(ra\\$*\"
+.
+.  hy \\n(HY
+..
+.
+.
+.\" Start email address.
+.de MT
+.  ds m1 \\$1\"
+.  nh
+.  if \\n(mH \{\
+.    \" Start diversion in a new environment.
+.    do ev URL-div
+.    do di URL-div
+.  \}
+..
+.
+.
+.\" End email address.
+.de ME
+.  ie \\n(mH \{\
+.    br
+.    di
+.    ev
+.
+.    \" Has there been one or more input lines for the link text?
+.    ie \\n(dn \{\
+.      do HTML-NS "<a href=""mailto:\\*(m1"">"
+.      \" Yes, strip off final newline of diversion and emit it.
+.      do chop URL-div
+.      do URL-div
+\c
+.      do HTML-NS </a>
+.    \}
+.    el \
+.      do HTML-NS "<a href=""mailto:\\*(m1"">\\*(m1</a>"
+\&\\$*\"
+.  \}
+.  el \
+\\*(la\\*(m1\\*(ra\\$*\"
+.
+.  hy \\n(HY
+..
+.\" --- End of lines taken from groff an-ext.tmac
+.\}
+.
+.hy 0
+.
+.SH NAME
+grep, egrep, fgrep \- print lines that match patterns
+.
+.SH SYNOPSIS
+.B grep
+.RI [ OPTION .\|.\|.]\&
+.I PATTERNS
+.RI [ FILE .\|.\|.]
+.br
+.B grep
+.RI [ OPTION .\|.\|.]\&
+.B \-e
+.I PATTERNS
+\&.\|.\|.\&
+.RI [ FILE .\|.\|.]
+.br
+.B grep
+.RI [ OPTION .\|.\|.]\&
+.B \-f
+.I PATTERN_FILE
+\&.\|.\|.\&
+.RI [ FILE .\|.\|.]
+.
+.SH DESCRIPTION
+.B grep
+searches for
+.I PATTERNS
+in each
+.IR FILE .
+.I PATTERNS
+is one or more patterns separated by newline characters, and
+.B grep
+prints each line that matches a pattern.
+Typically
+.I PATTERNS
+should be quoted when
+.B grep
+is used in a shell command.
+.PP
+A
+.I FILE
+of
+.RB "\*(lq" \- "\*(rq"
+stands for standard input.
+If no
+.I FILE
+is given, recursive searches examine the working directory,
+and nonrecursive searches read standard input.
+.PP
+In addition, the variant programs
+.B egrep
+and
+.B fgrep
+are the same as
+.B "grep\ \-E"
+and
+.BR "grep\ \-F" ,
+respectively.
+These variants are deprecated, but are provided for backward compatibility.
+.
+.SH OPTIONS
+.SS "Generic Program Information"
+.TP
+.B \-\^\-help
+Output a usage message and exit.
+.TP
+.BR \-V ", " \-\^\-version
+Output the version number of
+.B grep
+and exit.
+.SS "Pattern Syntax"
+.TP
+.BR \-E ", " \-\^\-extended\-regexp
+Interpret
+.I PATTERNS
+as extended regular expressions (EREs, see below).
+.TP
+.BR \-F ", " \-\^\-fixed\-strings
+Interpret
+.I PATTERNS
+as fixed strings, not regular expressions.
+.TP
+.BR \-G ", " \-\^\-basic\-regexp
+Interpret
+.I PATTERNS
+as basic regular expressions (BREs, see below).
+This is the default.
+.TP
+.BR \-P ", " \-\^\-perl\-regexp
+Interpret I<PATTERNS> as Perl-compatible regular expressions (PCREs).
+This option is experimental when combined with the
+.B \-z
+.RB ( \-\^\-null\-data )
+option, and
+.B "grep \-P"
+may warn of unimplemented features.
+.SS "Matching Control"
+.TP
+.BI \-e " PATTERNS" "\fR,\fP \-\^\-regexp=" PATTERNS
+Use
+.I PATTERNS
+as the patterns.
+If this option is used multiple times or is combined with the
+.B \-f
+.RB ( \-\^\-file )
+option, search for all patterns given.
+This option can be used to protect a pattern beginning with \*(lq\-\*(rq.
+.TP
+.BI \-f " FILE" "\fR,\fP \-\^\-file=" FILE
+Obtain patterns from
+.IR FILE ,
+one per line.
+If this option is used multiple times or is combined with the
+.B \-e
+.RB ( \-\^\-regexp )
+option, search for all patterns given.
+The empty file contains zero patterns, and therefore matches nothing.
+.TP
+.BR \-i ", " \-\^\-ignore\-case
+Ignore case distinctions in patterns and input data,
+so that characters that differ only in case
+match each other.
+.TP
+.B \-\^\-no\-ignore\-case
+Do not ignore case distinctions in patterns and input data.
+This is the default.
+This option is useful for passing to shell scripts that already use
+.BR \-i ,
+to cancel its effects because the two options override each other.
+.TP
+.BR \-v ", " \-\^\-invert\-match
+Invert the sense of matching, to select non-matching lines.
+.TP
+.BR \-w ", " \-\^\-word\-regexp
+Select only those lines containing matches that form whole words.
+The test is that the matching substring must either be at the
+beginning of the line, or preceded by a non-word constituent
+character.
+Similarly, it must be either at the end of the line
+or followed by a non-word constituent character.
+Word-constituent characters are letters, digits, and the underscore.
+This option has no effect if
+.B \-x
+is also specified.
+.TP
+.BR \-x ", " \-\^\-line\-regexp
+Select only those matches that exactly match the whole line.
+For a regular expression pattern, this is like parenthesizing the
+pattern and then surrounding it with
+.B ^
+and
+.BR $ .
+.TP
+.B \-y
+Obsolete synonym for
+.BR \-i .
+.SS "General Output Control"
+.TP
+.BR \-c ", " \-\^\-count
+Suppress normal output; instead print a count of
+matching lines for each input file.
+With the
+.BR \-v ", " \-\^\-invert\-match
+option (see below), count non-matching lines.
+.TP
+.BR \-\^\-color [ =\fIWHEN\fP "], " \-\^\-colour [ =\fIWHEN\fP ]
+Surround the matched (non-empty) strings, matching lines, context lines,
+file names, line numbers, byte offsets, and separators (for fields and
+groups of context lines) with escape sequences to display them in color
+on the terminal.
+The colors are defined by the environment variable
+.BR GREP_COLORS .
+The deprecated environment variable
+.B GREP_COLOR
+is still supported, but its setting does not have priority.
+.I WHEN
+is
+.BR never ", " always ", or " auto .
+.TP
+.BR \-L ", " \-\^\-files\-without\-match
+Suppress normal output; instead print the name
+of each input file from which no output would
+normally have been printed.
+.TP
+.BR \-l ", " \-\^\-files\-with\-matches
+Suppress normal output; instead print
+the name of each input file from which output
+would normally have been printed.
+Scanning each input file stops upon first match.
+.TP
+.BI \-m " NUM" "\fR,\fP \-\^\-max\-count=" NUM
+Stop reading a file after
+.I NUM
+matching lines.
+If the input is standard input from a regular file,
+and
+.I NUM
+matching lines are output,
+.B grep
+ensures that the standard input is positioned to just after the last
+matching line before exiting, regardless of the presence of trailing
+context lines.
+This enables a calling process to resume a search.
+When
+.B grep
+stops after
+.I NUM
+matching lines, it outputs any trailing context lines.
+When the
+.B \-c
+or
+.B \-\^\-count
+option is also used,
+.B grep
+does not output a count greater than
+.IR NUM .
+When the
+.B \-v
+or
+.B \-\^\-invert\-match
+option is also used,
+.B grep
+stops after outputting
+.I NUM
+non-matching lines.
+.TP
+.BR \-o ", " \-\^\-only\-matching
+Print only the matched (non-empty) parts of a matching line,
+with each such part on a separate output line.
+.TP
+.BR \-q ", " \-\^\-quiet ", " \-\^\-silent
+Quiet; do not write anything to standard output.
+Exit immediately with zero status if any match is found,
+even if an error was detected.
+Also see the
+.B \-s
+or
+.B \-\^\-no\-messages
+option.
+.TP
+.BR \-s ", " \-\^\-no\-messages
+Suppress error messages about nonexistent or unreadable files.
+.SS "Output Line Prefix Control"
+.TP
+.BR \-b ", " \-\^\-byte\-offset
+Print the 0-based byte offset within the input file
+before each line of output.
+If
+.B \-o
+.RB ( \-\^\-only\-matching )
+is specified,
+print the offset of the matching part itself.
+.TP
+.BR \-H ", " \-\^\-with\-filename
+Print the file name for each match.
+This is the default when there is more than one file to search.
+This is a GNU extension.
+.TP
+.BR \-h ", " \-\^\-no\-filename
+Suppress the prefixing of file names on output.
+This is the default when there is only one file
+(or only standard input) to search.
+.TP
+.BI \-\^\-label= LABEL
+Display input actually coming from standard input as input coming from file
+.IR LABEL .
+This can be useful for commands that transform a file's contents
+before searching,
+e.g.,
+.BR "gzip \-cd foo.gz | grep \-\^\-label=foo \-H 'some pattern'" .
+See also the
+.B \-H
+option.
+.TP
+.BR \-n ", " \-\^\-line\-number
+Prefix each line of output with the 1-based line number
+within its input file.
+.TP
+.BR \-T ", " \-\^\-initial\-tab
+Make sure that the first character of actual line content lies on a
+tab stop, so that the alignment of tabs looks normal.
+This is useful with options that prefix their output to the actual content:
+.BR \-H , \-n ,
+and
+.BR \-b .
+In order to improve the probability that lines
+from a single file will all start at the same column,
+this also causes the line number and byte offset (if present)
+to be printed in a minimum size field width.
+.TP
+.BR \-Z ", " \-\^\-null
+Output a zero byte (the ASCII
+.B NUL
+character) instead of the character that normally follows a file name.
+For example,
+.B "grep \-lZ"
+outputs a zero byte after each file name instead of the usual newline.
+This option makes the output unambiguous, even in the presence of file
+names containing unusual characters like newlines.
+This option can be used with commands like
+.BR "find \-print0" ,
+.BR "perl \-0" ,
+.BR "sort \-z" ,
+and
+.B "xargs \-0"
+to process arbitrary file names,
+even those that contain newline characters.
+.SS "Context Line Control"
+.TP
+.BI \-A " NUM" "\fR,\fP \-\^\-after\-context=" NUM
+Print
+.I NUM
+lines of trailing context after matching lines.
+Places a line containing a group separator
+.RB ( \-\^\- )
+between contiguous groups of matches.
+With the
+.B \-o
+or
+.B \-\^\-only\-matching
+option, this has no effect and a warning is given.
+.TP
+.BI \-B " NUM" "\fR,\fP \-\^\-before\-context=" NUM
+Print
+.I NUM
+lines of leading context before matching lines.
+Places a line containing a group separator
+.RB ( \-\^\- )
+between contiguous groups of matches.
+With the
+.B \-o
+or
+.B \-\^\-only\-matching
+option, this has no effect and a warning is given.
+.TP
+.BI \-C " NUM" "\fR,\fP \-" NUM "\fR,\fP \-\^\-context=" NUM
+Print
+.I NUM
+lines of output context.
+Places a line containing a group separator
+.RB ( \-\^\- )
+between contiguous groups of matches.
+With the
+.B \-o
+or
+.B \-\^\-only\-matching
+option, this has no effect and a warning is given.
+.TP
+.BI \-\^\-group\-separator= SEP
+When
+.BR \-A ,
+.BR \-B ,
+or
+.B \-C
+are in use, print
+.I SEP
+instead of
+.B \-\^\-
+between groups of lines.
+.TP
+.B \-\^\-no\-group\-separator
+When
+.BR \-A ,
+.BR \-B ,
+or
+.B \-C
+are in use, do not print a separator between groups of lines.
+.SS "File and Directory Selection"
+.TP
+.BR \-a ", " \-\^\-text
+Process a binary file as if it were text; this is equivalent to the
+.B \-\^\-binary\-files=text
+option.
+.TP
+.BI \-\^\-binary\-files= TYPE
+If a file's data or metadata
+indicate that the file contains binary data,
+assume that the file is of type
+.IR TYPE .
+Non-text bytes indicate binary data; these are either output bytes that are
+improperly encoded for the current locale, or null input bytes when the
+.B \-z
+option is not given.
+.IP
+By default,
+.I TYPE
+is
+.BR binary ,
+and
+.B grep
+suppresses output after null input binary data is discovered,
+and suppresses output lines that contain improperly encoded data.
+When some output is suppressed,
+.B grep
+follows any output
+with a one-line message saying that a binary file matches.
+.IP
+If
+.I TYPE
+is
+.BR without\-match ,
+when
+.B grep
+discovers null input binary data it assumes that the rest of the file
+does not match; this is equivalent to the
+.B \-I
+option.
+.IP
+If
+.I TYPE
+is
+.BR text ,
+.B grep
+processes a binary file as if it were text; this is equivalent to the
+.B \-a
+option.
+.IP
+When
+.I type
+is
+.BR binary ,
+.B grep
+may treat non-text bytes as line terminators even without the
+.B \-z
+option.  This means choosing
+.B binary
+versus
+.B text
+can affect whether a pattern matches a file.  For
+example, when
+.I type
+is
+.B binary
+the pattern
+.B q$ might
+match
+.B q
+immediately followed by a null byte, even though this
+is not matched when
+.I type
+is
+.BR text .
+Conversely, when
+.I type
+is
+.B binary
+the pattern
+.B .\&
+(period) might not match a null byte.
+.IP
+.I Warning:
+The
+.B \-a
+option might output binary garbage,
+which can have nasty side effects if the output is a terminal and if the
+terminal driver interprets some of it as commands.
+On the other hand, when reading files whose text encodings are
+unknown, it can be helpful to use
+.B \-a
+or to set
+.B LC_ALL='C'
+in the environment, in order to find more matches even if the matches
+are unsafe for direct display.
+.TP
+.BI \-D " ACTION" "\fR,\fP \-\^\-devices=" ACTION
+If an input file is a device, FIFO or socket, use
+.I ACTION
+to process it.
+By default,
+.I ACTION
+is
+.BR read ,
+which means that devices are read just as if they were ordinary files.
+If
+.I ACTION
+is
+.BR skip ,
+devices are silently skipped.
+.TP
+.BI \-d " ACTION" "\fR,\fP \-\^\-directories=" ACTION
+If an input file is a directory, use
+.I ACTION
+to process it.
+By default,
+.I ACTION
+is
+.BR read ,
+i.e., read directories just as if they were ordinary files.
+If
+.I ACTION
+is
+.BR skip ,
+silently skip directories.
+If
+.I ACTION
+is
+.BR recurse ,
+read all files under each directory, recursively,
+following symbolic links only if they are on the command line.
+This is equivalent to the
+.B \-r
+option.
+.TP
+.BI \-\^\-exclude= GLOB
+Skip any command-line file with a name suffix that matches the pattern
+.IR GLOB ,
+using wildcard matching; a name suffix is either the whole
+name, or a trailing part that starts with a non-slash character
+immediately after a slash
+.RB ( / )
+in the name.
+When searching recursively, skip any subfile whose base name matches
+.IR GLOB ;
+the base name is the part after the last slash.
+A pattern can use
+.BR * ,
+.BR ? ,
+and
+.BR [ .\|.\|. ]\&
+as wildcards, and
+.B \e
+to quote a wildcard or backslash character literally.
+.TP
+.BI \-\^\-exclude\-from= FILE
+Skip files whose base name matches any of the file-name globs read from
+.I FILE
+(using wildcard matching as described under
+.BR \-\^\-exclude ).
+.TP
+.BI \-\^\-exclude\-dir= GLOB
+Skip any command-line directory with a name suffix that matches the
+pattern
+.IR GLOB .
+When searching recursively, skip any subdirectory
+whose base name matches
+.IR GLOB .
+Ignore any redundant trailing slashes in
+.IR GLOB .
+.TP
+.BR \-I
+Process a binary file as if it did not contain matching data; this is
+equivalent to the
+.B \-\^\-binary\-files=without\-match
+option.
+.TP
+.BI \-\^\-include= GLOB
+Search only files whose base name matches
+.I GLOB
+(using wildcard matching as described under
+.BR \-\^\-exclude ).
+If contradictory
+.B \-\^\-include
+and
+.B \-\^\-exclude
+options are given, the last matching one wins.
+If no
+.B \-\^\-include
+or
+.B \-\^\-exclude
+options match, a file is included unless the first such option is
+.BR \-\^\-include .
+.TP
+.BR \-r ", " \-\^\-recursive
+Read all files under each directory, recursively,
+following symbolic links only if they are on the command line.
+Note that if no file operand is given, B<grep> searches the working directory.
+This is equivalent to the
+.B "\-d recurse"
+option.
+.TP
+.BR \-R ", " \-\^\-dereference\-recursive
+Read all files under each directory, recursively.
+Follow all symbolic links, unlike
+.BR \-r .
+.SS "Other Options"
+.TP
+.B \-\^\-line\-buffered
+Use line buffering on output.
+This can cause a performance penalty.
+.TP
+.BR \-U ", " \-\^\-binary
+Treat the file(s) as binary.
+By default, under MS-DOS and MS-Windows,
+.BR grep
+guesses whether a file is text or binary as described for the
+.B \-\^\-binary\-files
+option.
+If
+.BR grep
+decides the file is a text file, it strips the CR characters from the
+original file contents (to make regular expressions with
+.B ^
+and
+.B $
+work correctly).
+Specifying
+.B \-U
+overrules this guesswork, causing all files to be read and passed to the
+matching mechanism verbatim; if the file is a text file with CR/LF
+pairs at the end of each line, this will cause some regular
+expressions to fail.
+This option has no effect on platforms
+other than MS-DOS and MS-Windows.
+.TP
+.BR \-z ", " \-\^\-null\-data
+Treat input and output data as sequences of lines, each terminated by
+a zero byte (the ASCII NUL character) instead of a newline.
+Like the
+.B \-Z
+or
+.B \-\^\-null
+option, this option can be used with commands like
+.B sort -z
+to process arbitrary file names.
+.
+.SH "REGULAR EXPRESSIONS"
+A regular expression is a pattern that describes a set of strings.
+Regular expressions are constructed analogously to arithmetic
+expressions, by using various operators to combine smaller expressions.
+.PP
+.B grep
+understands three different versions of regular expression syntax:
+\*(lqbasic\*(rq (BRE), \*(lqextended\*(rq (ERE) and \*(lqperl\*(rq (PCRE).
+In GNU
+.B grep
+there is no difference in available functionality between basic and
+extended syntaxes.
+In other implementations, basic regular expressions are less powerful.
+The following description applies to extended regular expressions;
+differences for basic regular expressions are summarized afterwards.
+Perl-compatible regular expressions give additional functionality, and are
+documented in B<pcresyntax>(3) and B<pcrepattern>(3), but work only if
+PCRE support is enabled.
+.PP
+The fundamental building blocks are the regular expressions
+that match a single character.
+Most characters, including all letters and digits,
+are regular expressions that match themselves.
+Any meta-character with special meaning
+may be quoted by preceding it with a backslash.
+.PP
+The period
+.B .\&
+matches any single character.
+It is unspecified whether it matches an encoding error.
+.SS "Character Classes and Bracket Expressions"
+A
+.I "bracket expression"
+is a list of characters enclosed by
+.B [
+and
+.BR ] .
+It matches any single
+character in that list.
+If the first character of the list
+is the caret
+.B ^
+then it matches any character
+.I not
+in the list; it is unspecified whether it matches an encoding error.
+For example, the regular expression
+.B [0123456789]
+matches any single digit.
+.PP
+Within a bracket expression, a
+.I "range expression"
+consists of two characters separated by a hyphen.
+It matches any single character that sorts between the two characters,
+inclusive, using the locale's collating sequence and character set.
+For example, in the default C locale,
+.B [a\-d]
+is equivalent to
+.BR [abcd] .
+Many locales sort characters in dictionary order, and in these locales
+.B [a\-d]
+is typically not equivalent to
+.BR [abcd] ;
+it might be equivalent to
+.BR [aBbCcDd] ,
+for example.
+To obtain the traditional interpretation of bracket expressions,
+you can use the C locale by setting the
+.B LC_ALL
+environment variable to the value
+.BR C .
+.PP
+Finally, certain named classes of characters are predefined within
+bracket expressions, as follows.
+Their names are self explanatory, and they are
+.BR [:alnum:] ,
+.BR [:alpha:] ,
+.BR [:blank:] ,
+.BR [:cntrl:] ,
+.BR [:digit:] ,
+.BR [:graph:] ,
+.BR [:lower:] ,
+.BR [:print:] ,
+.BR [:punct:] ,
+.BR [:space:] ,
+.BR [:upper:] ,
+and
+.BR [:xdigit:] .
+For example,
+.B [[:alnum:]]
+means the character class of numbers and
+letters in the current locale.
+In the C locale and ASCII
+character set encoding, this is the same as
+.BR [0\-9A\-Za\-z] .
+(Note that the brackets in these class names are part of the symbolic
+names, and must be included in addition to the brackets delimiting
+the bracket expression.)
+Most meta-characters lose their special meaning inside bracket expressions.
+To include a literal
+.B ]
+place it first in the list.
+Similarly, to include a literal
+.B ^
+place it anywhere but first.
+Finally, to include a literal
+.B \-
+place it last.
+.SS Anchoring
+The caret
+.B ^
+and the dollar sign
+.B $
+are meta-characters that respectively match the empty string at the
+beginning and end of a line.
+.SS "The Backslash Character and Special Expressions"
+The symbols
+.B \e<
+and
+.B \e>
+respectively match the empty string at the beginning and end of a word.
+The symbol
+.B \eb
+matches the empty string at the edge of a word,
+and
+.B \eB
+matches the empty string provided it's
+.I not
+at the edge of a word.
+The symbol
+.B \ew
+is a synonym for
+.B [_[:alnum:]]
+and
+.B \eW
+is a synonym for
+.BR [^_[:alnum:]] .
+.SS Repetition
+A regular expression may be followed by one of several repetition operators:
+.PD 0
+.TP
+.B ?
+The preceding item is optional and matched at most once.
+.TP
+.B *
+The preceding item will be matched zero or more times.
+.TP
+.B +
+The preceding item will be matched one or more times.
+.TP
+.BI { n }
+The preceding item is matched exactly
+.I n
+times.
+.TP
+.BI { n ,}
+The preceding item is matched
+.I n
+or more times.
+.TP
+.BI {, m }
+The preceding item is matched at most
+.I m
+times.
+This is a GNU extension.
+.TP
+.BI { n , m }
+The preceding item is matched at least
+.I n
+times, but not more than
+.I m
+times.
+.PD
+.SS Concatenation
+Two regular expressions may be concatenated; the resulting
+regular expression matches any string formed by concatenating
+two substrings that respectively match the concatenated
+expressions.
+.SS Alternation
+Two regular expressions may be joined by the infix operator
+.BR | ;
+the resulting regular expression matches any string matching
+either alternate expression.
+.SS Precedence
+Repetition takes precedence over concatenation, which in turn
+takes precedence over alternation.
+A whole expression may be enclosed in parentheses
+to override these precedence rules and form a subexpression.
+.SS "Back-references and Subexpressions"
+The back-reference
+.BI \e n\c
+\&, where
+.I n
+is a single digit, matches the substring
+previously matched by the
+.IR n th
+parenthesized subexpression of the regular expression.
+.SS "Basic vs Extended Regular Expressions"
+In basic regular expressions the meta-characters
+.BR ? ,
+.BR + ,
+.BR { ,
+.BR | ,
+.BR ( ,
+and
+.BR )
+lose their special meaning; instead use the backslashed
+versions
+.BR \e? ,
+.BR \e+ ,
+.BR \e{ ,
+.BR \e| ,
+.BR \e( ,
+and
+.BR \e) .
+.
+.SH "EXIT STATUS"
+Normally the exit status is 0 if a line is selected, 1 if no lines
+were selected, and 2 if an error occurred.  However, if the
+.B \-q
+or
+.B \-\^\-quiet
+or
+.B \-\^\-silent
+is used and a line is selected, the exit status is 0 even if an error
+occurred.
+.
+.SH ENVIRONMENT
+The behavior of
+.B grep
+is affected by the following environment variables.
+.PP
+The locale for category
+.BI LC_ foo
+is specified by examining the three environment variables
+.BR LC_ALL ,
+.BR LC_\fIfoo\fP ,
+.BR LANG ,
+in that order.
+The first of these variables that is set specifies the locale.
+For example, if
+.B LC_ALL
+is not set, but
+.B LC_MESSAGES
+is set to
+.BR pt_BR ,
+then the Brazilian Portuguese locale is used for the
+.B LC_MESSAGES
+category.
+The C locale is used if none of these environment variables are set,
+if the locale catalog is not installed, or if
+.B grep
+was not compiled with national language support (NLS).
+The shell command
+.B "locale \-a"
+lists locales that are currently available.
+.TP
+.B GREP_COLOR
+This variable specifies the color used to highlight matched (non-empty) text.
+It is deprecated in favor of
+.BR GREP_COLORS ,
+but still supported.
+The
+.BR mt ,
+.BR ms ,
+and
+.B mc
+capabilities of
+.B GREP_COLORS
+have priority over it.
+It can only specify the color used to highlight
+the matching non-empty text in any matching line
+(a selected line when the
+.B \-v
+command-line option is omitted,
+or a context line when
+.B \-v
+is specified).
+The default is
+.BR 01;31 ,
+which means a bold red foreground text on the terminal's default background.
+.TP
+.B GREP_COLORS
+Specifies the colors and other attributes
+used to highlight various parts of the output.
+Its value is a colon-separated list of capabilities
+that defaults to
+.B ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36
+with the
+.B rv
+and
+.B ne
+boolean capabilities omitted (i.e., false).
+Supported capabilities are as follows.
+.RS
+.TP
+.B sl=
+SGR substring for whole selected lines
+(i.e.,
+matching lines when the
+.B \-v
+command-line option is omitted,
+or non-matching lines when
+.B \-v
+is specified).
+If however the boolean
+.B rv
+capability
+and the
+.B \-v
+command-line option are both specified,
+it applies to context matching lines instead.
+The default is empty (i.e., the terminal's default color pair).
+.TP
+.B cx=
+SGR substring for whole context lines
+(i.e.,
+non-matching lines when the
+.B \-v
+command-line option is omitted,
+or matching lines when
+.B \-v
+is specified).
+If however the boolean
+.B rv
+capability
+and the
+.B \-v
+command-line option are both specified,
+it applies to selected non-matching lines instead.
+The default is empty (i.e., the terminal's default color pair).
+.TP
+.B rv
+Boolean value that reverses (swaps) the meanings of
+the
+.B sl=
+and
+.B cx=
+capabilities
+when the
+.B \-v
+command-line option is specified.
+The default is false (i.e., the capability is omitted).
+.TP
+.B mt=01;31
+SGR substring for matching non-empty text in any matching line
+(i.e.,
+a selected line when the
+.B \-v
+command-line option is omitted,
+or a context line when
+.B \-v
+is specified).
+Setting this is equivalent to setting both
+.B ms=
+and
+.B mc=
+at once to the same value.
+The default is a bold red text foreground over the current line background.
+.TP
+.B ms=01;31
+SGR substring for matching non-empty text in a selected line.
+(This is only used when the
+.B \-v
+command-line option is omitted.)
+The effect of the
+.B sl=
+(or
+.B cx=
+if
+.BR rv )
+capability remains active when this kicks in.
+The default is a bold red text foreground over the current line background.
+.TP
+.B mc=01;31
+SGR substring for matching non-empty text in a context line.
+(This is only used when the
+.B \-v
+command-line option is specified.)
+The effect of the
+.B cx=
+(or
+.B sl=
+if
+.BR rv )
+capability remains active when this kicks in.
+The default is a bold red text foreground over the current line background.
+.TP
+.B fn=35
+SGR substring for file names prefixing any content line.
+The default is a magenta text foreground over the terminal's default background.
+.TP
+.B ln=32
+SGR substring for line numbers prefixing any content line.
+The default is a green text foreground over the terminal's default background.
+.TP
+.B bn=32
+SGR substring for byte offsets prefixing any content line.
+The default is a green text foreground over the terminal's default background.
+.TP
+.B se=36
+SGR substring for separators that are inserted
+between selected line fields
+.RB ( : ),
+between context line fields,
+.RB ( \- ),
+and between groups of adjacent lines when nonzero context is specified
+.RB ( \-\^\- ).
+The default is a cyan text foreground over the terminal's default background.
+.TP
+.B ne
+Boolean value that prevents clearing to the end of line
+using Erase in Line (EL) to Right
+.RB ( \e33[K )
+each time a colorized item ends.
+This is needed on terminals on which EL is not supported.
+It is otherwise useful on terminals
+for which the
+.B back_color_erase
+.RB ( bce )
+boolean terminfo capability does not apply,
+when the chosen highlight colors do not affect the background,
+or when EL is too slow or causes too much flicker.
+The default is false (i.e., the capability is omitted).
+.PP
+Note that boolean capabilities have no
+.BR = .\|.\|.\&
+part.
+They are omitted (i.e., false) by default and become true when specified.
+.PP
+See the Select Graphic Rendition (SGR) section
+in the documentation of the text terminal that is used
+for permitted values and their meaning as character attributes.
+These substring values are integers in decimal representation
+and can be concatenated with semicolons.
+.B grep
+takes care of assembling the result
+into a complete SGR sequence
+.RB ( \e33[ .\|.\|. m ).
+Common values to concatenate include
+.B 1
+for bold,
+.B 4
+for underline,
+.B 5
+for blink,
+.B 7
+for inverse,
+.B 39
+for default foreground color,
+.B 30
+to
+.B 37
+for foreground colors,
+.B 90
+to
+.B 97
+for 16-color mode foreground colors,
+.B 38;5;0
+to
+.B 38;5;255
+for 88-color and 256-color modes foreground colors,
+.B 49
+for default background color,
+.B 40
+to
+.B 47
+for background colors,
+.B 100
+to
+.B 107
+for 16-color mode background colors, and
+.B 48;5;0
+to
+.B 48;5;255
+for 88-color and 256-color modes background colors.
+.RE
+.TP
+\fBLC_ALL\fP, \fBLC_COLLATE\fP, \fBLANG\fP
+These variables specify the locale for the
+.B LC_COLLATE
+category,
+which determines the collating sequence
+used to interpret range expressions like
+.BR [a\-z] .
+.TP
+\fBLC_ALL\fP, \fBLC_CTYPE\fP, \fBLANG\fP
+These variables specify the locale for the
+.B LC_CTYPE
+category,
+which determines the type of characters,
+e.g., which characters are whitespace.
+This category also determines the character encoding, that is, whether
+text is encoded in UTF-8, ASCII, or some other encoding.  In the C or
+POSIX locale, all characters are encoded as a single byte and every
+byte is a valid character.
+.TP
+\fBLC_ALL\fP, \fBLC_MESSAGES\fP, \fBLANG\fP
+These variables specify the locale for the
+.B LC_MESSAGES
+category,
+which determines the language that
+.B grep
+uses for messages.
+The default C locale uses American English messages.
+.TP
+.B POSIXLY_CORRECT
+If set,
+.B grep
+behaves as POSIX requires; otherwise,
+.B grep
+behaves more like other GNU programs.
+POSIX requires that options that follow file names must be
+treated as file names; by default, such options are permuted to the
+front of the operand list and are treated as options.
+Also, POSIX requires that unrecognized options be diagnosed as
+\*(lqillegal\*(rq, but since they are not really against the law the default
+is to diagnose them as \*(lqinvalid\*(rq.
+.B POSIXLY_CORRECT
+also disables \fB_\fP\fIN\fP\fB_GNU_nonoption_argv_flags_\fP,
+described below.
+.TP
+\fB_\fP\fIN\fP\fB_GNU_nonoption_argv_flags_\fP
+(Here
+.I N
+is
+.BR grep 's
+numeric process ID.)  If the
+.IR i th
+character of this environment variable's value is
+.BR 1 ,
+do not consider the
+.IR i th
+operand of
+.B grep
+to be an option, even if it appears to be one.
+A shell can put this variable in the environment for each command it runs,
+specifying which operands are the results of file name wildcard
+expansion and therefore should not be treated as options.
+This behavior is available only with the GNU C library, and only
+when
+.B POSIXLY_CORRECT
+is not set.
+.
+.SH NOTES
+This man page is maintained only fitfully;
+the full documentation is often more up-to-date.
+.
+.SH COPYRIGHT
+Copyright 1998-2000, 2002, 2005-2021 Free Software Foundation, Inc.
+.PP
+This is free software;
+see the source for copying conditions.
+There is NO warranty;
+not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+.
+.SH BUGS
+.SS "Reporting Bugs"
+Email bug reports to
+.MT bug-grep@gnu.org
+the bug-reporting address
+.ME .
+An
+.UR https://lists.gnu.org/mailman/listinfo/bug-grep
+email archive
+.UE
+and a
+.UR https://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep
+bug tracker
+.UE
+are available.
+.SS "Known Bugs"
+Large repetition counts in the
+.BI { n , m }
+construct may cause
+.B grep
+to use lots of memory.
+In addition,
+certain other obscure regular expressions require exponential time
+and space, and may cause
+.B grep
+to run out of memory.
+.PP
+Back-references are very slow, and may require exponential time.
+.
+.SH EXAMPLE
+The following example outputs the location and contents of any line
+containing \*(lqf\*(rq and ending in \*(lq.c\*(rq,
+within all files in the current directory whose names
+contain \*(lqg\*(rq and end in \*(lq.h\*(rq.
+The
+.B \-n
+option outputs line numbers, the
+.B \-\-
+argument treats expansions of \*(lq*g*.h\*(rq starting with \*(lq\-\*(rq
+as file names not options,
+and the empty file /dev/null causes file names to be output
+even if only one file name happens to be of the form \*(lq*g*.h\*(rq.
+.PP
+.in +2n
+.EX
+$ \fBgrep\fP \-n \-\- 'f.*\e.c$' *g*.h /dev/null
+argmatch.h:1:/* definitions and prototypes for argmatch.c
+.EE
+.in
+.PP
+The only line that matches is line 1 of argmatch.h.
+Note that the regular expression syntax used in the pattern differs
+from the globbing syntax that the shell uses to match file names.
+.
+.SH "SEE ALSO"
+.SS "Regular Manual Pages"
+.BR awk (1),
+.BR cmp (1),
+.BR diff (1),
+.BR find (1),
+.BR perl (1),
+.BR sed (1),
+.BR sort (1),
+.BR xargs (1),
+.BR read (2),
+.BR pcre (3),
+.BR pcresyntax (3),
+.BR pcrepattern (3),
+.BR terminfo (5),
+.BR glob (7),
+.BR regex (7)
+.SS "Full Documentation"
+A
+.UR https://www.gnu.org/software/grep/manual/
+complete manual
+.UE
+is available.
+If the
+.B info
+and
+.B grep
+programs are properly installed at your site, the command
+.IP
+.B info grep
+.PP
+should give you access to the complete manual.
+.
+.\" Work around problems with some troff -man implementations.
+.br
+.
+.\" Format for Emacs-maintained Dt string defined at this file's start.
+.\" Local variables:
+.\" time-stamp-format: "%:y-%02m-%02d"
+.\" End:
diff --git a/src/grep/doc/grep.info b/src/grep/doc/grep.info
new file mode 100644
index 0000000..9e1a4bd
--- /dev/null
+++ b/src/grep/doc/grep.info
@@ -0,0 +1,2567 @@
+This is grep.info, produced by makeinfo version 6.8 from grep.texi.
+
+This manual is for ‘grep’, a pattern matching engine.
+
+   Copyright © 1999–2002, 2005, 2008–2021 Free Software Foundation, Inc.
+
+     Permission is granted to copy, distribute and/or modify this
+     document under the terms of the GNU Free Documentation License,
+     Version 1.3 or any later version published by the Free Software
+     Foundation; with no Invariant Sections, with no Front-Cover Texts,
+     and with no Back-Cover Texts. A copy of the license is included in
+     the section entitled “GNU Free Documentation License”.
+INFO-DIR-SECTION Text creation and manipulation
+START-INFO-DIR-ENTRY
+* grep: (grep).                 Print lines that match patterns.
+END-INFO-DIR-ENTRY
+
+
+File: grep.info,  Node: Top,  Next: Introduction,  Up: (dir)
+
+grep
+****
+
+‘grep’ prints lines that contain a match for one or more patterns.
+
+   This manual is for version 3.7 of GNU Grep.
+
+   This manual is for ‘grep’, a pattern matching engine.
+
+   Copyright © 1999–2002, 2005, 2008–2021 Free Software Foundation, Inc.
+
+     Permission is granted to copy, distribute and/or modify this
+     document under the terms of the GNU Free Documentation License,
+     Version 1.3 or any later version published by the Free Software
+     Foundation; with no Invariant Sections, with no Front-Cover Texts,
+     and with no Back-Cover Texts.  A copy of the license is included in
+     the section entitled “GNU Free Documentation License”.
+
+* Menu:
+
+* Introduction::                Introduction.
+* Invoking::                    Command-line options, environment, exit status.
+* Regular Expressions::         Regular Expressions.
+* Usage::                       Examples.
+* Performance::                 Performance tuning.
+* Reporting Bugs::              Reporting Bugs.
+* Copying::                     License terms for this manual.
+* Index::                       Combined index.
+
+
+File: grep.info,  Node: Introduction,  Next: Invoking,  Prev: Top,  Up: Top
+
+1 Introduction
+**************
+
+Given one or more patterns, ‘grep’ searches input files for matches to
+the patterns.  When it finds a match in a line, it copies the line to
+standard output (by default), or produces whatever other sort of output
+you have requested with options.
+
+   Though ‘grep’ expects to do the matching on text, it has no limits on
+input line length other than available memory, and it can match
+arbitrary characters within a line.  If the final byte of an input file
+is not a newline, ‘grep’ silently supplies one.  Since newline is also a
+separator for the list of patterns, there is no way to match newline
+characters in a text.
+
+
+File: grep.info,  Node: Invoking,  Next: Regular Expressions,  Prev: Introduction,  Up: Top
+
+2 Invoking ‘grep’
+*****************
+
+The general synopsis of the ‘grep’ command line is
+
+     grep [OPTION...] [PATTERNS] [FILE...]
+
+There can be zero or more OPTION arguments, and zero or more FILE
+arguments.  The PATTERNS argument contains one or more patterns
+separated by newlines, and is omitted when patterns are given via the
+‘-e PATTERNS’ or ‘-f FILE’ options.  Typically PATTERNS should be quoted
+when ‘grep’ is used in a shell command.
+
+* Menu:
+
+* Command-line Options::        Short and long names, grouped by category.
+* Environment Variables::       POSIX, GNU generic, and GNU grep specific.
+* Exit Status::                 Exit status returned by ‘grep’.
+* grep Programs::               ‘grep’ programs.
+
+
+File: grep.info,  Node: Command-line Options,  Next: Environment Variables,  Up: Invoking
+
+2.1 Command-line Options
+========================
+
+‘grep’ comes with a rich set of options: some from POSIX and some being
+GNU extensions.  Long option names are always a GNU extension, even for
+options that are from POSIX specifications.  Options that are specified
+by POSIX, under their short names, are explicitly marked as such to
+facilitate POSIX-portable programming.  A few option names are provided
+for compatibility with older or more exotic implementations.
+
+* Menu:
+
+* Generic Program Information::
+* Matching Control::
+* General Output Control::
+* Output Line Prefix Control::
+* Context Line Control::
+* File and Directory Selection::
+* Other Options::
+
+   Several additional options control which variant of the ‘grep’
+matching engine is used.  *Note grep Programs::.
+
+
+File: grep.info,  Node: Generic Program Information,  Next: Matching Control,  Up: Command-line Options
+
+2.1.1 Generic Program Information
+---------------------------------
+
+‘--help’
+     Print a usage message briefly summarizing the command-line options
+     and the bug-reporting address, then exit.
+
+‘-V’
+‘--version’
+     Print the version number of ‘grep’ to the standard output stream.
+     This version number should be included in all bug reports.
+
+
+File: grep.info,  Node: Matching Control,  Next: General Output Control,  Prev: Generic Program Information,  Up: Command-line Options
+
+2.1.2 Matching Control
+----------------------
+
+‘-e PATTERNS’
+‘--regexp=PATTERNS’
+     Use PATTERNS as one or more patterns; newlines within PATTERNS
+     separate each pattern from the next.  If this option is used
+     multiple times or is combined with the ‘-f’ (‘--file’) option,
+     search for all patterns given.  Typically PATTERNS should be quoted
+     when ‘grep’ is used in a shell command.  (‘-e’ is specified by
+     POSIX.)
+
+‘-f FILE’
+‘--file=FILE’
+     Obtain patterns from FILE, one per line.  If this option is used
+     multiple times or is combined with the ‘-e’ (‘--regexp’) option,
+     search for all patterns given.  The empty file contains zero
+     patterns, and therefore matches nothing.  (‘-f’ is specified by
+     POSIX.)
+
+‘-i’
+‘-y’
+‘--ignore-case’
+     Ignore case distinctions in patterns and input data, so that
+     characters that differ only in case match each other.  Although
+     this is straightforward when letters differ in case only via
+     lowercase-uppercase pairs, the behavior is unspecified in other
+     situations.  For example, uppercase “S” has an unusual lowercase
+     counterpart “ſ” (Unicode character U+017F, LATIN SMALL LETTER LONG
+     S) in many locales, and it is unspecified whether this unusual
+     character matches “S” or “s” even though uppercasing it yields “S”.
+     Another example: the lowercase German letter “ß” (U+00DF, LATIN
+     SMALL LETTER SHARP S) is normally capitalized as the two-character
+     string “SS” but it does not match “SS”, and it might not match the
+     uppercase letter “ẞ” (U+1E9E, LATIN CAPITAL LETTER SHARP S) even
+     though lowercasing the latter yields the former.
+
+     ‘-y’ is an obsolete synonym that is provided for compatibility.
+     (‘-i’ is specified by POSIX.)
+
+‘--no-ignore-case’
+     Do not ignore case distinctions in patterns and input data.  This
+     is the default.  This option is useful for passing to shell scripts
+     that already use ‘-i’, in order to cancel its effects because the
+     two options override each other.
+
+‘-v’
+‘--invert-match’
+     Invert the sense of matching, to select non-matching lines.  (‘-v’
+     is specified by POSIX.)
+
+‘-w’
+‘--word-regexp’
+     Select only those lines containing matches that form whole words.
+     The test is that the matching substring must either be at the
+     beginning of the line, or preceded by a non-word constituent
+     character.  Similarly, it must be either at the end of the line or
+     followed by a non-word constituent character.  Word constituent
+     characters are letters, digits, and the underscore.  This option
+     has no effect if ‘-x’ is also specified.
+
+     Because the ‘-w’ option can match a substring that does not begin
+     and end with word constituents, it differs from surrounding a
+     regular expression with ‘\<’ and ‘\>’.  For example, although ‘grep
+     -w @’ matches a line containing only ‘@’, ‘grep '\<@\>'’ cannot
+     match any line because ‘@’ is not a word constituent.  *Note The
+     Backslash Character and Special Expressions::.
+
+‘-x’
+‘--line-regexp’
+     Select only those matches that exactly match the whole line.  For
+     regular expression patterns, this is like parenthesizing each
+     pattern and then surrounding it with ‘^’ and ‘$’.  (‘-x’ is
+     specified by POSIX.)
+
+
+File: grep.info,  Node: General Output Control,  Next: Output Line Prefix Control,  Prev: Matching Control,  Up: Command-line Options
+
+2.1.3 General Output Control
+----------------------------
+
+‘-c’
+‘--count’
+     Suppress normal output; instead print a count of matching lines for
+     each input file.  With the ‘-v’ (‘--invert-match’) option, count
+     non-matching lines.  (‘-c’ is specified by POSIX.)
+
+‘--color[=WHEN]’
+‘--colour[=WHEN]’
+     Surround the matched (non-empty) strings, matching lines, context
+     lines, file names, line numbers, byte offsets, and separators (for
+     fields and groups of context lines) with escape sequences to
+     display them in color on the terminal.  The colors are defined by
+     the environment variable ‘GREP_COLORS’ and default to
+     ‘ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36’ for bold red
+     matched text, magenta file names, green line numbers, green byte
+     offsets, cyan separators, and default terminal colors otherwise.
+     The deprecated environment variable ‘GREP_COLOR’ is still
+     supported, but its setting does not have priority; it defaults to
+     ‘01;31’ (bold red) which only covers the color for matched text.
+     WHEN is ‘never’, ‘always’, or ‘auto’.
+
+‘-L’
+‘--files-without-match’
+     Suppress normal output; instead print the name of each input file
+     from which no output would normally have been printed.
+
+‘-l’
+‘--files-with-matches’
+     Suppress normal output; instead print the name of each input file
+     from which output would normally have been printed.  Scanning each
+     input file stops upon first match.  (‘-l’ is specified by POSIX.)
+
+‘-m NUM’
+‘--max-count=NUM’
+     Stop after the first NUM selected lines.  If the input is standard
+     input from a regular file, and NUM selected lines are output,
+     ‘grep’ ensures that the standard input is positioned just after the
+     last selected line before exiting, regardless of the presence of
+     trailing context lines.  This enables a calling process to resume a
+     search.  For example, the following shell script makes use of it:
+
+          while grep -m 1 'PATTERN'
+          do
+            echo xxxx
+          done < FILE
+
+     But the following probably will not work because a pipe is not a
+     regular file:
+
+          # This probably will not work.
+          cat FILE |
+          while grep -m 1 'PATTERN'
+          do
+            echo xxxx
+          done
+
+     When ‘grep’ stops after NUM selected lines, it outputs any trailing
+     context lines.  When the ‘-c’ or ‘--count’ option is also used,
+     ‘grep’ does not output a count greater than NUM.  When the ‘-v’ or
+     ‘--invert-match’ option is also used, ‘grep’ stops after outputting
+     NUM non-matching lines.
+
+‘-o’
+‘--only-matching’
+     Print only the matched (non-empty) parts of matching lines, with
+     each such part on a separate output line.  Output lines use the
+     same delimiters as input, and delimiters are null bytes if ‘-z’
+     (‘--null-data’) is also used (*note Other Options::).
+
+‘-q’
+‘--quiet’
+‘--silent’
+     Quiet; do not write anything to standard output.  Exit immediately
+     with zero status if any match is found, even if an error was
+     detected.  Also see the ‘-s’ or ‘--no-messages’ option.  (‘-q’ is
+     specified by POSIX.)
+
+‘-s’
+‘--no-messages’
+     Suppress error messages about nonexistent or unreadable files.
+     Portability note: unlike GNU ‘grep’, 7th Edition Unix ‘grep’ did
+     not conform to POSIX, because it lacked ‘-q’ and its ‘-s’ option
+     behaved like GNU ‘grep’’s ‘-q’ option.(1)  USG-style ‘grep’ also
+     lacked ‘-q’ but its ‘-s’ option behaved like GNU ‘grep’’s.
+     Portable shell scripts should avoid both ‘-q’ and ‘-s’ and should
+     redirect standard and error output to ‘/dev/null’ instead.  (‘-s’
+     is specified by POSIX.)
+
+   ---------- Footnotes ----------
+
+   (1) Of course, 7th Edition Unix predated POSIX by several years!
+
+
+File: grep.info,  Node: Output Line Prefix Control,  Next: Context Line Control,  Prev: General Output Control,  Up: Command-line Options
+
+2.1.4 Output Line Prefix Control
+--------------------------------
+
+When several prefix fields are to be output, the order is always file
+name, line number, and byte offset, regardless of the order in which
+these options were specified.
+
+‘-b’
+‘--byte-offset’
+     Print the 0-based byte offset within the input file before each
+     line of output.  If ‘-o’ (‘--only-matching’) is specified, print
+     the offset of the matching part itself.
+
+‘-H’
+‘--with-filename’
+     Print the file name for each match.  This is the default when there
+     is more than one file to search.
+
+‘-h’
+‘--no-filename’
+     Suppress the prefixing of file names on output.  This is the
+     default when there is only one file (or only standard input) to
+     search.
+
+‘--label=LABEL’
+     Display input actually coming from standard input as input coming
+     from file LABEL.  This can be useful for commands that transform a
+     file’s contents before searching; e.g.:
+
+          gzip -cd foo.gz | grep --label=foo -H 'some pattern'
+
+‘-n’
+‘--line-number’
+     Prefix each line of output with the 1-based line number within its
+     input file.  (‘-n’ is specified by POSIX.)
+
+‘-T’
+‘--initial-tab’
+     Make sure that the first character of actual line content lies on a
+     tab stop, so that the alignment of tabs looks normal.  This is
+     useful with options that prefix their output to the actual content:
+     ‘-H’, ‘-n’, and ‘-b’.  This may also prepend spaces to output line
+     numbers and byte offsets so that lines from a single file all start
+     at the same column.
+
+‘-Z’
+‘--null’
+     Output a zero byte (the ASCII NUL character) instead of the
+     character that normally follows a file name.  For example, ‘grep
+     -lZ’ outputs a zero byte after each file name instead of the usual
+     newline.  This option makes the output unambiguous, even in the
+     presence of file names containing unusual characters like newlines.
+     This option can be used with commands like ‘find -print0’, ‘perl
+     -0’, ‘sort -z’, and ‘xargs -0’ to process arbitrary file names,
+     even those that contain newline characters.
+
+
+File: grep.info,  Node: Context Line Control,  Next: File and Directory Selection,  Prev: Output Line Prefix Control,  Up: Command-line Options
+
+2.1.5 Context Line Control
+--------------------------
+
+“Context lines” are non-matching lines that are near a matching line.
+They are output only if one of the following options are used.
+Regardless of how these options are set, ‘grep’ never outputs any given
+line more than once.  If the ‘-o’ (‘--only-matching’) option is
+specified, these options have no effect and a warning is given upon
+their use.
+
+‘-A NUM’
+‘--after-context=NUM’
+     Print NUM lines of trailing context after matching lines.
+
+‘-B NUM’
+‘--before-context=NUM’
+     Print NUM lines of leading context before matching lines.
+
+‘-C NUM’
+‘-NUM’
+‘--context=NUM’
+     Print NUM lines of leading and trailing output context.
+
+‘--group-separator=STRING’
+     When ‘-A’, ‘-B’ or ‘-C’ are in use, print STRING instead of ‘--’
+     between groups of lines.
+
+‘--no-group-separator’
+     When ‘-A’, ‘-B’ or ‘-C’ are in use, do not print a separator
+     between groups of lines.
+
+   Here are some points about how ‘grep’ chooses the separator to print
+between prefix fields and line content:
+
+   • Matching lines normally use ‘:’ as a separator between prefix
+     fields and actual line content.
+
+   • Context (i.e., non-matching) lines use ‘-’ instead.
+
+   • When context is not specified, matching lines are simply output one
+     right after another.
+
+   • When context is specified, lines that are adjacent in the input
+     form a group and are output one right after another, while by
+     default a separator appears between non-adjacent groups.
+
+   • The default separator is a ‘--’ line; its presence and appearance
+     can be changed with the options above.
+
+   • Each group may contain several matching lines when they are close
+     enough to each other that two adjacent groups connect and can merge
+     into a single contiguous one.
+
+
+File: grep.info,  Node: File and Directory Selection,  Next: Other Options,  Prev: Context Line Control,  Up: Command-line Options
+
+2.1.6 File and Directory Selection
+----------------------------------
+
+‘-a’
+‘--text’
+     Process a binary file as if it were text; this is equivalent to the
+     ‘--binary-files=text’ option.
+
+‘--binary-files=TYPE’
+     If a file’s data or metadata indicate that the file contains binary
+     data, assume that the file is of type TYPE.  Non-text bytes
+     indicate binary data; these are either output bytes that are
+     improperly encoded for the current locale (*note Environment
+     Variables::), or null input bytes when the ‘-z’ (‘--null-data’)
+     option is not given (*note Other Options::).
+
+     By default, TYPE is ‘binary’, and ‘grep’ suppresses output after
+     null input binary data is discovered, and suppresses output lines
+     that contain improperly encoded data.  When some output is
+     suppressed, ‘grep’ follows any output with a one-line message
+     saying that a binary file matches.
+
+     If TYPE is ‘without-match’, when ‘grep’ discovers null input binary
+     data it assumes that the rest of the file does not match; this is
+     equivalent to the ‘-I’ option.
+
+     If TYPE is ‘text’, ‘grep’ processes binary data as if it were text;
+     this is equivalent to the ‘-a’ option.
+
+     When TYPE is ‘binary’, ‘grep’ may treat non-text bytes as line
+     terminators even without the ‘-z’ (‘--null-data’) option.  This
+     means choosing ‘binary’ versus ‘text’ can affect whether a pattern
+     matches a file.  For example, when TYPE is ‘binary’ the pattern
+     ‘q$’ might match ‘q’ immediately followed by a null byte, even
+     though this is not matched when TYPE is ‘text’.  Conversely, when
+     TYPE is ‘binary’ the pattern ‘.’ (period) might not match a null
+     byte.
+
+     _Warning:_ The ‘-a’ (‘--binary-files=text’) option might output
+     binary garbage, which can have nasty side effects if the output is
+     a terminal and if the terminal driver interprets some of it as
+     commands.  On the other hand, when reading files whose text
+     encodings are unknown, it can be helpful to use ‘-a’ or to set
+     ‘LC_ALL='C'’ in the environment, in order to find more matches even
+     if the matches are unsafe for direct display.
+
+‘-D ACTION’
+‘--devices=ACTION’
+     If an input file is a device, FIFO, or socket, use ACTION to
+     process it.  If ACTION is ‘read’, all devices are read just as if
+     they were ordinary files.  If ACTION is ‘skip’, devices, FIFOs, and
+     sockets are silently skipped.  By default, devices are read if they
+     are on the command line or if the ‘-R’ (‘--dereference-recursive’)
+     option is used, and are skipped if they are encountered recursively
+     and the ‘-r’ (‘--recursive’) option is used.  This option has no
+     effect on a file that is read via standard input.
+
+‘-d ACTION’
+‘--directories=ACTION’
+     If an input file is a directory, use ACTION to process it.  By
+     default, ACTION is ‘read’, which means that directories are read
+     just as if they were ordinary files (some operating systems and
+     file systems disallow this, and will cause ‘grep’ to print error
+     messages for every directory or silently skip them).  If ACTION is
+     ‘skip’, directories are silently skipped.  If ACTION is ‘recurse’,
+     ‘grep’ reads all files under each directory, recursively, following
+     command-line symbolic links and skipping other symlinks; this is
+     equivalent to the ‘-r’ option.
+
+‘--exclude=GLOB’
+     Skip any command-line file with a name suffix that matches the
+     pattern GLOB, using wildcard matching; a name suffix is either the
+     whole name, or a trailing part that starts with a non-slash
+     character immediately after a slash (‘/’) in the name.  When
+     searching recursively, skip any subfile whose base name matches
+     GLOB; the base name is the part after the last slash.  A pattern
+     can use ‘*’, ‘?’, and ‘[’...‘]’  as wildcards, and ‘\’ to quote a
+     wildcard or backslash character literally.
+
+‘--exclude-from=FILE’
+     Skip files whose name matches any of the patterns read from FILE
+     (using wildcard matching as described under ‘--exclude’).
+
+‘--exclude-dir=GLOB’
+     Skip any command-line directory with a name suffix that matches the
+     pattern GLOB.  When searching recursively, skip any subdirectory
+     whose base name matches GLOB.  Ignore any redundant trailing
+     slashes in GLOB.
+
+‘-I’
+     Process a binary file as if it did not contain matching data; this
+     is equivalent to the ‘--binary-files=without-match’ option.
+
+‘--include=GLOB’
+     Search only files whose name matches GLOB, using wildcard matching
+     as described under ‘--exclude’.  If contradictory ‘--include’ and
+     ‘--exclude’ options are given, the last matching one wins.  If no
+     ‘--include’ or ‘--exclude’ options match, a file is included unless
+     the first such option is ‘--include’.
+
+‘-r’
+‘--recursive’
+     For each directory operand, read and process all files in that
+     directory, recursively.  Follow symbolic links on the command line,
+     but skip symlinks that are encountered recursively.  Note that if
+     no file operand is given, grep searches the working directory.
+     This is the same as the ‘--directories=recurse’ option.
+
+‘-R’
+‘--dereference-recursive’
+     For each directory operand, read and process all files in that
+     directory, recursively, following all symbolic links.
+
+
+File: grep.info,  Node: Other Options,  Prev: File and Directory Selection,  Up: Command-line Options
+
+2.1.7 Other Options
+-------------------
+
+‘--’
+     Delimit the option list.  Later arguments, if any, are treated as
+     operands even if they begin with ‘-’.  For example, ‘grep PAT --
+     -file1 file2’ searches for the pattern PAT in the files named
+     ‘-file1’ and ‘file2’.
+
+‘--line-buffered’
+     Use line buffering for standard output, regardless of output
+     device.  By default, standard output is line buffered for
+     interactive devices, and is fully buffered otherwise.  With full
+     buffering, the output buffer is flushed when full; with line
+     buffering, the buffer is also flushed after every output line.  The
+     buffer size is system dependent.
+
+‘-U’
+‘--binary’
+     On platforms that distinguish between text and binary I/O, use the
+     latter when reading and writing files other than the user’s
+     terminal, so that all input bytes are read and written as-is.  This
+     overrides the default behavior where ‘grep’ follows the operating
+     system’s advice whether to use text or binary I/O.  On MS-Windows
+     when ‘grep’ uses text I/O it reads a carriage return–newline pair
+     as a newline and a Control-Z as end-of-file, and it writes a
+     newline as a carriage return–newline pair.
+
+     When using text I/O ‘--byte-offset’ (‘-b’) counts and
+     ‘--binary-files’ heuristics apply to input data after text-I/O
+     processing.  Also, the ‘--binary-files’ heuristics need not agree
+     with the ‘--binary’ option; that is, they may treat the data as
+     text even if ‘--binary’ is given, or vice versa.  *Note File and
+     Directory Selection::.
+
+     This option has no effect on GNU and other POSIX-compatible
+     platforms, which do not distinguish text from binary I/O.
+
+‘-z’
+‘--null-data’
+     Treat input and output data as sequences of lines, each terminated
+     by a zero byte (the ASCII NUL character) instead of a newline.
+     Like the ‘-Z’ or ‘--null’ option, this option can be used with
+     commands like ‘sort -z’ to process arbitrary file names.
+
+
+File: grep.info,  Node: Environment Variables,  Next: Exit Status,  Prev: Command-line Options,  Up: Invoking
+
+2.2 Environment Variables
+=========================
+
+The behavior of ‘grep’ is affected by the following environment
+variables.
+
+   The locale for category ‘LC_FOO’ is specified by examining the three
+environment variables ‘LC_ALL’, ‘LC_FOO’, and ‘LANG’, in that order.
+The first of these variables that is set specifies the locale.  For
+example, if ‘LC_ALL’ is not set, but ‘LC_COLLATE’ is set to ‘pt_BR’,
+then the Brazilian Portuguese locale is used for the ‘LC_COLLATE’
+category.  As a special case for ‘LC_MESSAGES’ only, the environment
+variable ‘LANGUAGE’ can contain a colon-separated list of languages that
+overrides the three environment variables that ordinarily specify the
+‘LC_MESSAGES’ category.  The ‘C’ locale is used if none of these
+environment variables are set, if the locale catalog is not installed,
+or if ‘grep’ was not compiled with national language support (NLS). The
+shell command ‘locale -a’ lists locales that are currently available.
+
+   Many of the environment variables in the following list let you
+control highlighting using Select Graphic Rendition (SGR) commands
+interpreted by the terminal or terminal emulator.  (See the section in
+the documentation of your text terminal for permitted values and their
+meanings as character attributes.)  These substring values are integers
+in decimal representation and can be concatenated with semicolons.
+‘grep’ takes care of assembling the result into a complete SGR sequence
+(‘\33[’...‘m’).  Common values to concatenate include ‘1’ for bold, ‘4’
+for underline, ‘5’ for blink, ‘7’ for inverse, ‘39’ for default
+foreground color, ‘30’ to ‘37’ for foreground colors, ‘90’ to ‘97’ for
+16-color mode foreground colors, ‘38;5;0’ to ‘38;5;255’ for 88-color and
+256-color modes foreground colors, ‘49’ for default background color,
+‘40’ to ‘47’ for background colors, ‘100’ to ‘107’ for 16-color mode
+background colors, and ‘48;5;0’ to ‘48;5;255’ for 88-color and 256-color
+modes background colors.
+
+   The two-letter names used in the ‘GREP_COLORS’ environment variable
+(and some of the others) refer to terminal “capabilities,” the ability
+of a terminal to highlight text, or change its color, and so on.  These
+capabilities are stored in an online database and accessed by the
+‘terminfo’ library.
+
+‘GREP_COLOR’
+     This variable specifies the color used to highlight matched
+     (non-empty) text.  It is deprecated in favor of ‘GREP_COLORS’, but
+     still supported.  The ‘mt’, ‘ms’, and ‘mc’ capabilities of
+     ‘GREP_COLORS’ have priority over it.  It can only specify the color
+     used to highlight the matching non-empty text in any matching line
+     (a selected line when the ‘-v’ command-line option is omitted, or a
+     context line when ‘-v’ is specified).  The default is ‘01;31’,
+     which means a bold red foreground text on the terminal’s default
+     background.
+
+‘GREP_COLORS’
+     This variable specifies the colors and other attributes used to
+     highlight various parts of the output.  Its value is a
+     colon-separated list of ‘terminfo’ capabilities that defaults to
+     ‘ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36’ with the ‘rv’
+     and ‘ne’ boolean capabilities omitted (i.e., false).  Supported
+     capabilities are as follows.
+
+     ‘sl=’
+          SGR substring for whole selected lines (i.e., matching lines
+          when the ‘-v’ command-line option is omitted, or non-matching
+          lines when ‘-v’ is specified).  If however the boolean ‘rv’
+          capability and the ‘-v’ command-line option are both
+          specified, it applies to context matching lines instead.  The
+          default is empty (i.e., the terminal’s default color pair).
+
+     ‘cx=’
+          SGR substring for whole context lines (i.e., non-matching
+          lines when the ‘-v’ command-line option is omitted, or
+          matching lines when ‘-v’ is specified).  If however the
+          boolean ‘rv’ capability and the ‘-v’ command-line option are
+          both specified, it applies to selected non-matching lines
+          instead.  The default is empty (i.e., the terminal’s default
+          color pair).
+
+     ‘rv’
+          Boolean value that reverses (swaps) the meanings of the ‘sl=’
+          and ‘cx=’ capabilities when the ‘-v’ command-line option is
+          specified.  The default is false (i.e., the capability is
+          omitted).
+
+     ‘mt=01;31’
+          SGR substring for matching non-empty text in any matching line
+          (i.e., a selected line when the ‘-v’ command-line option is
+          omitted, or a context line when ‘-v’ is specified).  Setting
+          this is equivalent to setting both ‘ms=’ and ‘mc=’ at once to
+          the same value.  The default is a bold red text foreground
+          over the current line background.
+
+     ‘ms=01;31’
+          SGR substring for matching non-empty text in a selected line.
+          (This is used only when the ‘-v’ command-line option is
+          omitted.)  The effect of the ‘sl=’ (or ‘cx=’ if ‘rv’)
+          capability remains active when this takes effect.  The default
+          is a bold red text foreground over the current line
+          background.
+
+     ‘mc=01;31’
+          SGR substring for matching non-empty text in a context line.
+          (This is used only when the ‘-v’ command-line option is
+          specified.)  The effect of the ‘cx=’ (or ‘sl=’ if ‘rv’)
+          capability remains active when this takes effect.  The default
+          is a bold red text foreground over the current line
+          background.
+
+     ‘fn=35’
+          SGR substring for file names prefixing any content line.  The
+          default is a magenta text foreground over the terminal’s
+          default background.
+
+     ‘ln=32’
+          SGR substring for line numbers prefixing any content line.
+          The default is a green text foreground over the terminal’s
+          default background.
+
+     ‘bn=32’
+          SGR substring for byte offsets prefixing any content line.
+          The default is a green text foreground over the terminal’s
+          default background.
+
+     ‘se=36’
+          SGR substring for separators that are inserted between
+          selected line fields (‘:’), between context line fields (‘-’),
+          and between groups of adjacent lines when nonzero context is
+          specified (‘--’).  The default is a cyan text foreground over
+          the terminal’s default background.
+
+     ‘ne’
+          Boolean value that prevents clearing to the end of line using
+          Erase in Line (EL) to Right (‘\33[K’) each time a colorized
+          item ends.  This is needed on terminals on which EL is not
+          supported.  It is otherwise useful on terminals for which the
+          ‘back_color_erase’ (‘bce’) boolean ‘terminfo’ capability does
+          not apply, when the chosen highlight colors do not affect the
+          background, or when EL is too slow or causes too much flicker.
+          The default is false (i.e., the capability is omitted).
+
+     Note that boolean capabilities have no ‘=’...  part.  They are
+     omitted (i.e., false) by default and become true when specified.
+
+‘LC_ALL’
+‘LC_COLLATE’
+‘LANG’
+     These variables specify the locale for the ‘LC_COLLATE’ category,
+     which might affect how range expressions like ‘[a-z]’ are
+     interpreted.
+
+‘LC_ALL’
+‘LC_CTYPE’
+‘LANG’
+     These variables specify the locale for the ‘LC_CTYPE’ category,
+     which determines the type of characters, e.g., which characters are
+     whitespace.  This category also determines the character encoding.
+     *Note Character Encoding::.
+
+‘LANGUAGE’
+‘LC_ALL’
+‘LC_MESSAGES’
+‘LANG’
+     These variables specify the locale for the ‘LC_MESSAGES’ category,
+     which determines the language that ‘grep’ uses for messages.  The
+     default ‘C’ locale uses American English messages.
+
+‘POSIXLY_CORRECT’
+     If set, ‘grep’ behaves as POSIX requires; otherwise, ‘grep’ behaves
+     more like other GNU programs.  POSIX requires that options that
+     follow file names must be treated as file names; by default, such
+     options are permuted to the front of the operand list and are
+     treated as options.  Also, ‘POSIXLY_CORRECT’ disables special
+     handling of an invalid bracket expression.  *Note
+     invalid-bracket-expr::.
+
+‘_N_GNU_nonoption_argv_flags_’
+     (Here ‘N’ is ‘grep’’s numeric process ID.) If the Ith character of
+     this environment variable’s value is ‘1’, do not consider the Ith
+     operand of ‘grep’ to be an option, even if it appears to be one.  A
+     shell can put this variable in the environment for each command it
+     runs, specifying which operands are the results of file name
+     wildcard expansion and therefore should not be treated as options.
+     This behavior is available only with the GNU C library, and only
+     when ‘POSIXLY_CORRECT’ is not set.
+
+   The ‘GREP_OPTIONS’ environment variable of ‘grep’ 2.20 and earlier is
+no longer supported, as it caused problems when writing portable
+scripts.  To make arbitrary changes to how ‘grep’ works, you can use an
+alias or script instead.  For example, if ‘grep’ is in the directory
+‘/usr/bin’ you can prepend ‘$HOME/bin’ to your ‘PATH’ and create an
+executable script ‘$HOME/bin/grep’ containing the following:
+
+     #! /bin/sh
+     export PATH=/usr/bin
+     exec grep --color=auto --devices=skip "$@"
+
+
+File: grep.info,  Node: Exit Status,  Next: grep Programs,  Prev: Environment Variables,  Up: Invoking
+
+2.3 Exit Status
+===============
+
+Normally the exit status is 0 if a line is selected, 1 if no lines were
+selected, and 2 if an error occurred.  However, if the ‘-q’ or ‘--quiet’
+or ‘--silent’ option is used and a line is selected, the exit status is
+0 even if an error occurred.  Other ‘grep’ implementations may exit with
+status greater than 2 on error.
+
+
+File: grep.info,  Node: grep Programs,  Prev: Exit Status,  Up: Invoking
+
+2.4 ‘grep’ Programs
+===================
+
+‘grep’ searches the named input files for lines containing a match to
+the given patterns.  By default, ‘grep’ prints the matching lines.  A
+file named ‘-’ stands for standard input.  If no input is specified,
+‘grep’ searches the working directory ‘.’ if given a command-line option
+specifying recursion; otherwise, ‘grep’ searches standard input.  There
+are four major variants of ‘grep’, controlled by the following options.
+
+‘-G’
+‘--basic-regexp’
+     Interpret patterns as basic regular expressions (BREs).  This is
+     the default.
+
+‘-E’
+‘--extended-regexp’
+     Interpret patterns as extended regular expressions (EREs).  (‘-E’
+     is specified by POSIX.)
+
+‘-F’
+‘--fixed-strings’
+     Interpret patterns as fixed strings, not regular expressions.
+     (‘-F’ is specified by POSIX.)
+
+‘-P’
+‘--perl-regexp’
+     Interpret patterns as Perl-compatible regular expressions (PCREs).
+     PCRE support is here to stay, but consider this option experimental
+     when combined with the ‘-z’ (‘--null-data’) option, and note that
+     ‘grep -P’ may warn of unimplemented features.  *Note Other
+     Options::.
+
+   In addition, two variant programs ‘egrep’ and ‘fgrep’ are available.
+‘egrep’ is the same as ‘grep -E’.  ‘fgrep’ is the same as ‘grep -F’.
+Direct invocation as either ‘egrep’ or ‘fgrep’ is deprecated, but is
+provided to allow historical applications that rely on them to run
+unmodified.
+
+
+File: grep.info,  Node: Regular Expressions,  Next: Usage,  Prev: Invoking,  Up: Top
+
+3 Regular Expressions
+*********************
+
+A “regular expression” is a pattern that describes a set of strings.
+Regular expressions are constructed analogously to arithmetic
+expressions, by using various operators to combine smaller expressions.
+‘grep’ understands three different versions of regular expression
+syntax: basic (BRE), extended (ERE), and Perl-compatible (PCRE). In GNU
+‘grep’, there is no difference in available functionality between the
+basic and extended syntaxes.  In other implementations, basic regular
+expressions are less powerful.  The following description applies to
+extended regular expressions; differences for basic regular expressions
+are summarized afterwards.  Perl-compatible regular expressions give
+additional functionality, and are documented in the pcresyntax(3) and
+pcrepattern(3) manual pages, but work only if PCRE is available in the
+system.
+
+* Menu:
+
+* Fundamental Structure::
+* Character Classes and Bracket Expressions::
+* The Backslash Character and Special Expressions::
+* Anchoring::
+* Back-references and Subexpressions::
+* Basic vs Extended::
+* Character Encoding::
+* Matching Non-ASCII::
+
+
+File: grep.info,  Node: Fundamental Structure,  Next: Character Classes and Bracket Expressions,  Up: Regular Expressions
+
+3.1 Fundamental Structure
+=========================
+
+In regular expressions, the characters ‘.?*+{|()[\^$’ are “special
+characters” and have uses described below.  All other characters are
+“ordinary characters”, and each ordinary character is a regular
+expression that matches itself.
+
+   The period ‘.’ matches any single character.  It is unspecified
+whether ‘.’ matches an encoding error.
+
+   A regular expression may be followed by one of several repetition
+operators; the operators beginning with ‘{’ are called “interval
+expressions”.
+
+‘?’
+     The preceding item is optional and is matched at most once.
+
+‘*’
+     The preceding item is matched zero or more times.
+
+‘+’
+     The preceding item is matched one or more times.
+
+‘{N}’
+     The preceding item is matched exactly N times.
+
+‘{N,}’
+     The preceding item is matched N or more times.
+
+‘{,M}’
+     The preceding item is matched at most M times.  This is a GNU
+     extension.
+
+‘{N,M}’
+     The preceding item is matched at least N times, but not more than M
+     times.
+
+   The empty regular expression matches the empty string.  Two regular
+expressions may be concatenated; the resulting regular expression
+matches any string formed by concatenating two substrings that
+respectively match the concatenated expressions.
+
+   Two regular expressions may be joined by the infix operator ‘|’; the
+resulting regular expression matches any string matching either
+alternate expression.
+
+   Repetition takes precedence over concatenation, which in turn takes
+precedence over alternation.  A whole expression may be enclosed in
+parentheses to override these precedence rules and form a subexpression.
+An unmatched ‘)’ matches just itself.
+
+
+File: grep.info,  Node: Character Classes and Bracket Expressions,  Next: The Backslash Character and Special Expressions,  Prev: Fundamental Structure,  Up: Regular Expressions
+
+3.2 Character Classes and Bracket Expressions
+=============================================
+
+A “bracket expression” is a list of characters enclosed by ‘[’ and ‘]’.
+It matches any single character in that list.  If the first character of
+the list is the caret ‘^’, then it matches any character *not* in the
+list, and it is unspecified whether it matches an encoding error.  For
+example, the regular expression ‘[0123456789]’ matches any single digit,
+whereas ‘[^()]’ matches any single character that is not an opening or
+closing parenthesis, and might or might not match an encoding error.
+
+   Within a bracket expression, a “range expression” consists of two
+characters separated by a hyphen.  It matches any single character that
+sorts between the two characters, inclusive.  In the default C locale,
+the sorting sequence is the native character order; for example, ‘[a-d]’
+is equivalent to ‘[abcd]’.  In other locales, the sorting sequence is
+not specified, and ‘[a-d]’ might be equivalent to ‘[abcd]’ or to
+‘[aBbCcDd]’, or it might fail to match any character, or the set of
+characters that it matches might even be erratic.  To obtain the
+traditional interpretation of bracket expressions, you can use the ‘C’
+locale by setting the ‘LC_ALL’ environment variable to the value ‘C’.
+
+   Finally, certain named classes of characters are predefined within
+bracket expressions, as follows.  Their interpretation depends on the
+‘LC_CTYPE’ locale; for example, ‘[[:alnum:]]’ means the character class
+of numbers and letters in the current locale.
+
+‘[:alnum:]’
+     Alphanumeric characters: ‘[:alpha:]’ and ‘[:digit:]’; in the ‘C’
+     locale and ASCII character encoding, this is the same as
+     ‘[0-9A-Za-z]’.
+
+‘[:alpha:]’
+     Alphabetic characters: ‘[:lower:]’ and ‘[:upper:]’; in the ‘C’
+     locale and ASCII character encoding, this is the same as
+     ‘[A-Za-z]’.
+
+‘[:blank:]’
+     Blank characters: space and tab.
+
+‘[:cntrl:]’
+     Control characters.  In ASCII, these characters have octal codes
+     000 through 037, and 177 (DEL). In other character sets, these are
+     the equivalent characters, if any.
+
+‘[:digit:]’
+     Digits: ‘0 1 2 3 4 5 6 7 8 9’.
+
+‘[:graph:]’
+     Graphical characters: ‘[:alnum:]’ and ‘[:punct:]’.
+
+‘[:lower:]’
+     Lower-case letters; in the ‘C’ locale and ASCII character encoding,
+     this is ‘a b c d e f g h i j k l m n o p q r s t u v w x y z’.
+
+‘[:print:]’
+     Printable characters: ‘[:alnum:]’, ‘[:punct:]’, and space.
+
+‘[:punct:]’
+     Punctuation characters; in the ‘C’ locale and ASCII character
+     encoding, this is ‘! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \
+     ] ^ _ ` { | } ~’.
+
+‘[:space:]’
+     Space characters: in the ‘C’ locale, this is tab, newline, vertical
+     tab, form feed, carriage return, and space.  *Note Usage::, for
+     more discussion of matching newlines.
+
+‘[:upper:]’
+     Upper-case letters: in the ‘C’ locale and ASCII character encoding,
+     this is ‘A B C D E F G H I J K L M N O P Q R S T U V W X Y Z’.
+
+‘[:xdigit:]’
+     Hexadecimal digits: ‘0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f’.
+
+   Note that the brackets in these class names are part of the symbolic
+names, and must be included in addition to the brackets delimiting the
+bracket expression.
+
+   If you mistakenly omit the outer brackets, and search for say,
+‘[:upper:]’, GNU ‘grep’ prints a diagnostic and exits with status 2, on
+the assumption that you did not intend to search for the nominally
+equivalent regular expression: ‘[:epru]’.  Set the ‘POSIXLY_CORRECT’
+environment variable to disable this feature.
+
+   Special characters lose their special meaning inside bracket
+expressions.
+
+‘]’
+     ends the bracket expression if it’s not the first list item.  So,
+     if you want to make the ‘]’ character a list item, you must put it
+     first.
+
+‘[.’
+     represents the open collating symbol.
+
+‘.]’
+     represents the close collating symbol.
+
+‘[=’
+     represents the open equivalence class.
+
+‘=]’
+     represents the close equivalence class.
+
+‘[:’
+     represents the open character class symbol, and should be followed
+     by a valid character class name.
+
+‘:]’
+     represents the close character class symbol.
+
+‘-’
+     represents the range if it’s not first or last in a list or the
+     ending point of a range.
+
+‘^’
+     represents the characters not in the list.  If you want to make the
+     ‘^’ character a list item, place it anywhere but first.
+
+
+File: grep.info,  Node: The Backslash Character and Special Expressions,  Next: Anchoring,  Prev: Character Classes and Bracket Expressions,  Up: Regular Expressions
+
+3.3 The Backslash Character and Special Expressions
+===================================================
+
+The ‘\’ character followed by a special character is a regular
+expression that matches the special character.  The ‘\’ character, when
+followed by certain ordinary characters, takes a special meaning:
+
+‘\b’
+     Match the empty string at the edge of a word.
+
+‘\B’
+     Match the empty string provided it’s not at the edge of a word.
+
+‘\<’
+     Match the empty string at the beginning of a word.
+
+‘\>’
+     Match the empty string at the end of a word.
+
+‘\w’
+     Match word constituent, it is a synonym for ‘[_[:alnum:]]’.
+
+‘\W’
+     Match non-word constituent, it is a synonym for ‘[^_[:alnum:]]’.
+
+‘\s’
+     Match whitespace, it is a synonym for ‘[[:space:]]’.
+
+‘\S’
+     Match non-whitespace, it is a synonym for ‘[^[:space:]]’.
+
+   For example, ‘\brat\b’ matches the separate word ‘rat’, ‘\Brat\B’
+matches ‘crate’ but not ‘furry rat’.
+
+
+File: grep.info,  Node: Anchoring,  Next: Back-references and Subexpressions,  Prev: The Backslash Character and Special Expressions,  Up: Regular Expressions
+
+3.4 Anchoring
+=============
+
+The caret ‘^’ and the dollar sign ‘$’ are special characters that
+respectively match the empty string at the beginning and end of a line.
+They are termed “anchors”, since they force the match to be “anchored”
+to beginning or end of a line, respectively.
+
+
+File: grep.info,  Node: Back-references and Subexpressions,  Next: Basic vs Extended,  Prev: Anchoring,  Up: Regular Expressions
+
+3.5 Back-references and Subexpressions
+======================================
+
+The back-reference ‘\N’, where N is a single nonzero digit, matches the
+substring previously matched by the Nth parenthesized subexpression of
+the regular expression.  For example, ‘(a)\1’ matches ‘aa’.  If the
+parenthesized subexpression does not participate in the match, the
+back-reference makes the whole match fail; for example, ‘(a)*\1’ fails
+to match ‘a’.  If the parenthesized subexpression matches more than one
+substring, the back-reference refers to the last matched substring; for
+example, ‘^(ab*)*\1$’ matches ‘ababbabb’ but not ‘ababbab’.  When
+multiple regular expressions are given with ‘-e’ or from a file (‘-f
+FILE’), back-references are local to each expression.
+
+   *Note Known Bugs::, for some known problems with back-references.
+
+
+File: grep.info,  Node: Basic vs Extended,  Next: Character Encoding,  Prev: Back-references and Subexpressions,  Up: Regular Expressions
+
+3.6 Basic vs Extended Regular Expressions
+=========================================
+
+In basic regular expressions the characters ‘?’, ‘+’, ‘{’, ‘|’, ‘(’, and
+‘)’ lose their special meaning; instead use the backslashed versions
+‘\?’, ‘\+’, ‘\{’, ‘\|’, ‘\(’, and ‘\)’.  Also, a backslash is needed
+before an interval expression’s closing ‘}’, and an unmatched ‘\)’ is
+invalid.
+
+   Portable scripts should avoid the following constructs, as POSIX says
+they produce undefined results:
+
+   • Extended regular expressions that use back-references.
+   • Basic regular expressions that use ‘\?’, ‘\+’, or ‘\|’.
+   • Empty parenthesized regular expressions like ‘()’.
+   • Empty alternatives (as in, e.g, ‘a|’).
+   • Repetition operators that immediately follow empty expressions,
+     unescaped ‘$’, or other repetition operators.
+   • A backslash escaping an ordinary character (e.g., ‘\S’), unless it
+     is a back-reference.
+   • An unescaped ‘[’ that is not part of a bracket expression.
+   • In extended regular expressions, an unescaped ‘{’ that is not part
+     of an interval expression.
+
+   Traditional ‘egrep’ did not support interval expressions and some
+‘egrep’ implementations use ‘\{’ and ‘\}’ instead, so portable scripts
+should avoid interval expressions in ‘grep -E’ patterns and should use
+‘[{]’ to match a literal ‘{’.
+
+   GNU ‘grep -E’ attempts to support traditional usage by assuming that
+‘{’ is not special if it would be the start of an invalid interval
+expression.  For example, the command ‘grep -E '{1'’ searches for the
+two-character string ‘{1’ instead of reporting a syntax error in the
+regular expression.  POSIX allows this behavior as an extension, but
+portable scripts should avoid it.
+
+
+File: grep.info,  Node: Character Encoding,  Next: Matching Non-ASCII,  Prev: Basic vs Extended,  Up: Regular Expressions
+
+3.7 Character Encoding
+======================
+
+The ‘LC_CTYPE’ locale specifies the encoding of characters in patterns
+and data, that is, whether text is encoded in UTF-8, ASCII, or some
+other encoding.  *Note Environment Variables::.
+
+   In the ‘C’ or ‘POSIX’ locale, every character is encoded as a single
+byte and every byte is a valid character.  In more-complex encodings
+such as UTF-8, a sequence of multiple bytes may be needed to represent a
+character, and some bytes may be encoding errors that do not contribute
+to the representation of any character.  POSIX does not specify the
+behavior of ‘grep’ when patterns or input data contain encoding errors
+or null characters, so portable scripts should avoid such usage.  As an
+extension to POSIX, GNU ‘grep’ treats null characters like any other
+character.  However, unless the ‘-a’ (‘--binary-files=text’) option is
+used, the presence of null characters in input or of encoding errors in
+output causes GNU ‘grep’ to treat the file as binary and suppress
+details about matches.  *Note File and Directory Selection::.
+
+   Regardless of locale, the 103 characters in the POSIX Portable
+Character Set (a subset of ASCII) are always encoded as a single byte,
+and the 128 ASCII characters have their usual single-byte encodings on
+all but oddball platforms.
+
+
+File: grep.info,  Node: Matching Non-ASCII,  Prev: Character Encoding,  Up: Regular Expressions
+
+3.8 Matching Non-ASCII and Non-printable Characters
+===================================================
+
+In a regular expression, non-ASCII and non-printable characters other
+than newline are not special, and represent themselves.  For example, in
+a locale using UTF-8 the command ‘grep 'Λ ω'’ (where the white space
+between ‘Λ’ and the ‘ω’ is a tab character) searches for ‘Λ’ (Unicode
+character U+039B GREEK CAPITAL LETTER LAMBDA), followed by a tab (U+0009
+TAB), followed by ‘ω’ (U+03C9 GREEK SMALL LETTER OMEGA).
+
+   Suppose you want to limit your pattern to only printable characters
+(or even only printable ASCII characters) to keep your script readable
+or portable, but you also want to match specific non-ASCII or non-null
+non-printable characters.  If you are using the ‘-P’ (‘--perl-regexp’)
+option, PCREs give you several ways to do this.  Otherwise, if you are
+using Bash, the GNU project’s shell, you can represent these characters
+via ANSI-C quoting.  For example, the Bash commands ‘grep $'Λ\tω'’ and
+‘grep $'\u039B\t\u03C9'’ both search for the same three-character string
+‘Λ ω’ mentioned earlier.  However, because Bash translates ANSI-C
+quoting before ‘grep’ sees the pattern, this technique should not be
+used to match printable ASCII characters; for example, ‘grep $'\u005E'’
+is equivalent to ‘grep '^'’ and matches any line, not just lines
+containing the character ‘^’ (U+005E CIRCUMFLEX ACCENT).
+
+   Since PCREs and ANSI-C quoting are GNU extensions to POSIX, portable
+shell scripts written in ASCII should use other methods to match
+specific non-ASCII characters.  For example, in a UTF-8 locale the
+command ‘grep "$(printf '\316\233\t\317\211\n')"’ is a portable albeit
+hard-to-read alternative to Bash’s ‘grep $'Λ\tω'’.  However, none of
+these techniques will let you put a null character directly into a
+command-line pattern; null characters can appear only in a pattern
+specified via the ‘-f’ (‘--file’) option.
+
+
+File: grep.info,  Node: Usage,  Next: Performance,  Prev: Regular Expressions,  Up: Top
+
+4 Usage
+*******
+
+Here is an example command that invokes GNU ‘grep’:
+
+     grep -i 'hello.*world' menu.h main.c
+
+This lists all lines in the files ‘menu.h’ and ‘main.c’ that contain the
+string ‘hello’ followed by the string ‘world’; this is because ‘.*’
+matches zero or more characters within a line.  *Note Regular
+Expressions::.  The ‘-i’ option causes ‘grep’ to ignore case, causing it
+to match the line ‘Hello, world!’, which it would not otherwise match.
+
+   Here is a more complex example, showing the location and contents of
+any line containing ‘f’ and ending in ‘.c’, within all files in the
+current directory whose names start with non-‘.’, contain ‘g’, and end
+in ‘.h’.  The ‘-n’ option outputs line numbers, the ‘--’ argument treats
+any later arguments as file names not options even if ‘*g*.h’ expands to
+a file name that starts with ‘-’, and the empty file ‘/dev/null’ causes
+file names to be output even if only one file name happens to be of the
+form ‘*g*.h’.
+
+     grep -n -- 'f.*\.c$' *g*.h /dev/null
+
+Note that the regular expression syntax used in the pattern differs from
+the globbing syntax that the shell uses to match file names.
+
+   *Note Invoking::, for more details about how to invoke ‘grep’.
+
+   Here are some common questions and answers about ‘grep’ usage.
+
+  1. How can I list just the names of matching files?
+
+          grep -l 'main' test-*.c
+
+     lists names of ‘test-*.c’ files in the current directory whose
+     contents mention ‘main’.
+
+  2. How do I search directories recursively?
+
+          grep -r 'hello' /home/gigi
+
+     searches for ‘hello’ in all files under the ‘/home/gigi’ directory.
+     For more control over which files are searched, use ‘find’ and
+     ‘grep’.  For example, the following command searches only C files:
+
+          find /home/gigi -name '*.c' ! -type d \
+            -exec grep -H 'hello' '{}' +
+
+     This differs from the command:
+
+          grep -H 'hello' /home/gigi/*.c
+
+     which merely looks for ‘hello’ in non-hidden C files in
+     ‘/home/gigi’ whose names end in ‘.c’.  The ‘find’ command line
+     above is more similar to the command:
+
+          grep -r --include='*.c' 'hello' /home/gigi
+
+  3. What if a pattern or file has a leading ‘-’?
+
+          grep -- '--cut here--' *
+
+     searches for all lines matching ‘--cut here--’.  Without ‘--’,
+     ‘grep’ would attempt to parse ‘--cut here--’ as a list of options,
+     and there would be similar problems with any file names beginning
+     with ‘-’.
+
+     Alternatively, you can prevent misinterpretation of leading ‘-’ by
+     using ‘-e’ for patterns and leading ‘./’ for files:
+
+          grep -e '--cut here--' ./*
+
+  4. Suppose I want to search for a whole word, not a part of a word?
+
+          grep -w 'hello' test*.log
+
+     searches only for instances of ‘hello’ that are entire words; it
+     does not match ‘Othello’.  For more control, use ‘\<’ and ‘\>’ to
+     match the start and end of words.  For example:
+
+          grep 'hello\>' test*.log
+
+     searches only for words ending in ‘hello’, so it matches the word
+     ‘Othello’.
+
+  5. How do I output context around the matching lines?
+
+          grep -C 2 'hello' test*.log
+
+     prints two lines of context around each matching line.
+
+  6. How do I force ‘grep’ to print the name of the file?
+
+     Append ‘/dev/null’:
+
+          grep 'eli' /etc/passwd /dev/null
+
+     gets you:
+
+          /etc/passwd:eli:x:2098:1000:Eli Smith:/home/eli:/bin/bash
+
+     Alternatively, use ‘-H’, which is a GNU extension:
+
+          grep -H 'eli' /etc/passwd
+
+  7. Why do people use strange regular expressions on ‘ps’ output?
+
+          ps -ef | grep '[c]ron'
+
+     If the pattern had been written without the square brackets, it
+     would have matched not only the ‘ps’ output line for ‘cron’, but
+     also the ‘ps’ output line for ‘grep’.  Note that on some platforms,
+     ‘ps’ limits the output to the width of the screen; ‘grep’ does not
+     have any limit on the length of a line except the available memory.
+
+  8. Why does ‘grep’ report “Binary file matches”?
+
+     If ‘grep’ listed all matching “lines” from a binary file, it would
+     probably generate output that is not useful, and it might even muck
+     up your display.  So GNU ‘grep’ suppresses output from files that
+     appear to be binary files.  To force GNU ‘grep’ to output lines
+     even from files that appear to be binary, use the ‘-a’ or
+     ‘--binary-files=text’ option.  To eliminate the “Binary file
+     matches” messages, use the ‘-I’ or ‘--binary-files=without-match’
+     option, or the ‘-s’ or ‘--no-messages’ option.
+
+  9. Why doesn’t ‘grep -lv’ print non-matching file names?
+
+     ‘grep -lv’ lists the names of all files containing one or more
+     lines that do not match.  To list the names of all files that
+     contain no matching lines, use the ‘-L’ or ‘--files-without-match’
+     option.
+
+  10. I can do “OR” with ‘|’, but what about “AND”?
+
+          grep 'paul' /etc/motd | grep 'franc,ois'
+
+     finds all lines that contain both ‘paul’ and ‘franc,ois’.
+
+  11. Why does the empty pattern match every input line?
+
+     The ‘grep’ command searches for lines that contain strings that
+     match a pattern.  Every line contains the empty string, so an empty
+     pattern causes ‘grep’ to find a match on each line.  It is not the
+     only such pattern: ‘^’, ‘$’, and many other patterns cause ‘grep’
+     to match every line.
+
+     To match empty lines, use the pattern ‘^$’.  To match blank lines,
+     use the pattern ‘^[[:blank:]]*$’.  To match no lines at all, use
+     the command ‘grep -f /dev/null’.
+
+  12. How can I search in both standard input and in files?
+
+     Use the special file name ‘-’:
+
+          cat /etc/passwd | grep 'alain' - /etc/motd
+
+  13. Why is this back-reference failing?
+
+          echo 'ba' | grep -E '(a)\1|b\1'
+
+     This outputs an error message, because the second ‘\1’ has nothing
+     to refer back to, meaning it will never match anything.
+
+  14. How can I match across lines?
+
+     Standard grep cannot do this, as it is fundamentally line-based.
+     Therefore, merely using the ‘[:space:]’ character class does not
+     match newlines in the way you might expect.
+
+     With the GNU ‘grep’ option ‘-z’ (‘--null-data’), each input and
+     output “line” is null-terminated; *note Other Options::.  Thus, you
+     can match newlines in the input, but typically if there is a match
+     the entire input is output, so this usage is often combined with
+     output-suppressing options like ‘-q’, e.g.:
+
+          printf 'foo\nbar\n' | grep -z -q 'foo[[:space:]]\+bar'
+
+     If this does not suffice, you can transform the input before giving
+     it to ‘grep’, or turn to ‘awk’, ‘sed’, ‘perl’, or many other
+     utilities that are designed to operate across lines.
+
+  15. What do ‘grep’, ‘fgrep’, and ‘egrep’ stand for?
+
+     The name ‘grep’ comes from the way line editing was done on Unix.
+     For example, ‘ed’ uses the following syntax to print a list of
+     matching lines on the screen:
+
+          global/regular expression/print
+          g/re/p
+
+     ‘fgrep’ stands for Fixed ‘grep’; ‘egrep’ stands for Extended
+     ‘grep’.
+
+
+File: grep.info,  Node: Performance,  Next: Reporting Bugs,  Prev: Usage,  Up: Top
+
+5 Performance
+*************
+
+Typically ‘grep’ is an efficient way to search text.  However, it can be
+quite slow in some cases, and it can search large files where even minor
+performance tweaking can help significantly.  Although the algorithm
+used by ‘grep’ is an implementation detail that can change from release
+to release, understanding its basic strengths and weaknesses can help
+you improve its performance.
+
+   The ‘grep’ command operates partly via a set of automata that are
+designed for efficiency, and partly via a slower matcher that takes over
+when the fast matchers run into unusual features like back-references.
+When feasible, the Boyer–Moore fast string searching algorithm is used
+to match a single fixed pattern, and the Aho–Corasick algorithm is used
+to match multiple fixed patterns.
+
+   Generally speaking ‘grep’ operates more efficiently in single-byte
+locales, since it can avoid the special processing needed for multi-byte
+characters.  If your patterns will work just as well that way, setting
+‘LC_ALL’ to a single-byte locale can help performance considerably.
+Setting ‘LC_ALL='C'’ can be particularly efficient, as ‘grep’ is tuned
+for that locale.
+
+   Outside the ‘C’ locale, case-insensitive search, and search for
+bracket expressions like ‘[a-z]’ and ‘[[=a=]b]’, can be surprisingly
+inefficient due to difficulties in fast portable access to concepts like
+multi-character collating elements.
+
+   A back-reference such as ‘\1’ can hurt performance significantly in
+some cases, since back-references cannot in general be implemented via a
+finite state automaton, and instead trigger a backtracking algorithm
+that can be quite inefficient.  For example, although the pattern
+‘^(.*)\1{14}(.*)\2{13}$’ matches only lines whose lengths can be written
+as a sum 15x + 14y for nonnegative integers x and y, the pattern matcher
+does not perform linear Diophantine analysis and instead backtracks
+through all possible matching strings, using an algorithm that is
+exponential in the worst case.
+
+   On some operating systems that support files with holes—large regions
+of zeros that are not physically present on secondary storage—‘grep’ can
+skip over the holes efficiently without needing to read the zeros.  This
+optimization is not available if the ‘-a’ (‘--binary-files=text’) option
+is used (*note File and Directory Selection::), unless the ‘-z’
+(‘--null-data’) option is also used (*note Other Options::).
+
+   For more about the algorithms used by ‘grep’ and about related string
+matching algorithms, see:
+
+   • Aho AV. Algorithms for finding patterns in strings. In: van Leeuwen
+     J. _Handbook of Theoretical Computer Science_, vol. A. New York:
+     Elsevier; 1990. p. 255–300. This surveys classic string matching
+     algorithms, some of which are used by ‘grep’.
+
+   • Aho AV, Corasick MJ. Efficient string matching: an aid to
+     bibliographic search. _CACM_. 1975;18(6):333–40.
+     <https://dx.doi.org/10.1145/360825.360855>. This introduces the
+     Aho–Corasick algorithm.
+
+   • Boyer RS, Moore JS. A fast string searching algorithm. _CACM_.
+     1977;20(10):762–72. <https://dx.doi.org/10.1145/359842.359859>.
+     This introduces the Boyer–Moore algorithm.
+
+   • Faro S, Lecroq T. The exact online string matching problem: a
+     review of the most recent results. _ACM Comput Surv_.
+     2013;45(2):13. <https://dx.doi.org/10.1145/2431211.2431212>. This
+     surveys string matching algorithms that might help improve the
+     performance of ‘grep’ in the future.
+
+
+File: grep.info,  Node: Reporting Bugs,  Next: Copying,  Prev: Performance,  Up: Top
+
+6 Reporting bugs
+****************
+
+Bug reports can be found at the GNU bug report logs for ‘grep’
+(https://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep).  If you find a
+bug not listed there, please email it to <bug-grep@gnu.org> to create a
+new bug report.
+
+* Menu:
+
+* Known Bugs::
+
+
+File: grep.info,  Node: Known Bugs,  Up: Reporting Bugs
+
+6.1 Known Bugs
+==============
+
+Large repetition counts in the ‘{n,m}’ construct may cause ‘grep’ to use
+lots of memory.  In addition, certain other obscure regular expressions
+require exponential time and space, and may cause ‘grep’ to run out of
+memory.
+
+   Back-references can greatly slow down matching, as they can generate
+exponentially many matching possibilities that can consume both time and
+memory to explore.  Also, the POSIX specification for back-references is
+at times unclear.  Furthermore, many regular expression implementations
+have back-reference bugs that can cause programs to return incorrect
+answers or even crash, and fixing these bugs has often been
+low-priority: for example, as of 2021 the GNU C library bug database
+(https://sourceware.org/bugzilla/) contained back-reference bugs 52,
+10844, 11053, 24269 and 25322, with little sign of forthcoming fixes.
+Luckily, back-references are rarely useful and it should be little
+trouble to avoid them in practical applications.
+
+
+File: grep.info,  Node: Copying,  Next: Index,  Prev: Reporting Bugs,  Up: Top
+
+7 Copying
+*********
+
+GNU ‘grep’ is licensed under the GNU GPL, which makes it “free
+software”.
+
+   The “free” in “free software” refers to liberty, not price.  As some
+GNU project advocates like to point out, think of “free speech” rather
+than “free beer”.  In short, you have the right (freedom) to run and
+change ‘grep’ and distribute it to other people, and—if you want—charge
+money for doing either.  The important restriction is that you have to
+grant your recipients the same rights and impose the same restrictions.
+
+   This general method of licensing software is sometimes called “open
+source”.  The GNU project prefers the term “free software” for reasons
+outlined at
+<https://www.gnu.org/philosophy/open-source-misses-the-point.html>.
+
+   This manual is free documentation in the same sense.  The
+documentation license is included below.  The license for the program is
+available with the source code, or at
+<https://www.gnu.org/licenses/gpl.html>.
+
+* Menu:
+
+* GNU Free Documentation License::
+
+
+File: grep.info,  Node: GNU Free Documentation License,  Up: Copying
+
+7.1 GNU Free Documentation License
+==================================
+
+                     Version 1.3, 3 November 2008
+
+     Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
+     <https://fsf.org/>
+
+     Everyone is permitted to copy and distribute verbatim copies
+     of this license document, but changing it is not allowed.
+
+  0. PREAMBLE
+
+     The purpose of this License is to make a manual, textbook, or other
+     functional and useful document “free” in the sense of freedom: to
+     assure everyone the effective freedom to copy and redistribute it,
+     with or without modifying it, either commercially or
+     noncommercially.  Secondarily, this License preserves for the
+     author and publisher a way to get credit for their work, while not
+     being considered responsible for modifications made by others.
+
+     This License is a kind of “copyleft”, which means that derivative
+     works of the document must themselves be free in the same sense.
+     It complements the GNU General Public License, which is a copyleft
+     license designed for free software.
+
+     We have designed this License in order to use it for manuals for
+     free software, because free software needs free documentation: a
+     free program should come with manuals providing the same freedoms
+     that the software does.  But this License is not limited to
+     software manuals; it can be used for any textual work, regardless
+     of subject matter or whether it is published as a printed book.  We
+     recommend this License principally for works whose purpose is
+     instruction or reference.
+
+  1. APPLICABILITY AND DEFINITIONS
+
+     This License applies to any manual or other work, in any medium,
+     that contains a notice placed by the copyright holder saying it can
+     be distributed under the terms of this License.  Such a notice
+     grants a world-wide, royalty-free license, unlimited in duration,
+     to use that work under the conditions stated herein.  The
+     “Document”, below, refers to any such manual or work.  Any member
+     of the public is a licensee, and is addressed as “you”.  You accept
+     the license if you copy, modify or distribute the work in a way
+     requiring permission under copyright law.
+
+     A “Modified Version” of the Document means any work containing the
+     Document or a portion of it, either copied verbatim, or with
+     modifications and/or translated into another language.
+
+     A “Secondary Section” is a named appendix or a front-matter section
+     of the Document that deals exclusively with the relationship of the
+     publishers or authors of the Document to the Document’s overall
+     subject (or to related matters) and contains nothing that could
+     fall directly within that overall subject.  (Thus, if the Document
+     is in part a textbook of mathematics, a Secondary Section may not
+     explain any mathematics.)  The relationship could be a matter of
+     historical connection with the subject or with related matters, or
+     of legal, commercial, philosophical, ethical or political position
+     regarding them.
+
+     The “Invariant Sections” are certain Secondary Sections whose
+     titles are designated, as being those of Invariant Sections, in the
+     notice that says that the Document is released under this License.
+     If a section does not fit the above definition of Secondary then it
+     is not allowed to be designated as Invariant.  The Document may
+     contain zero Invariant Sections.  If the Document does not identify
+     any Invariant Sections then there are none.
+
+     The “Cover Texts” are certain short passages of text that are
+     listed, as Front-Cover Texts or Back-Cover Texts, in the notice
+     that says that the Document is released under this License.  A
+     Front-Cover Text may be at most 5 words, and a Back-Cover Text may
+     be at most 25 words.
+
+     A “Transparent” copy of the Document means a machine-readable copy,
+     represented in a format whose specification is available to the
+     general public, that is suitable for revising the document
+     straightforwardly with generic text editors or (for images composed
+     of pixels) generic paint programs or (for drawings) some widely
+     available drawing editor, and that is suitable for input to text
+     formatters or for automatic translation to a variety of formats
+     suitable for input to text formatters.  A copy made in an otherwise
+     Transparent file format whose markup, or absence of markup, has
+     been arranged to thwart or discourage subsequent modification by
+     readers is not Transparent.  An image format is not Transparent if
+     used for any substantial amount of text.  A copy that is not
+     “Transparent” is called “Opaque”.
+
+     Examples of suitable formats for Transparent copies include plain
+     ASCII without markup, Texinfo input format, LaTeX input format,
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+     simple HTML, PostScript or PDF designed for human modification.
+     Examples of transparent image formats include PNG, XCF and JPG.
+     Opaque formats include proprietary formats that can be read and
+     edited only by proprietary word processors, SGML or XML for which
+     the DTD and/or processing tools are not generally available, and
+     the machine-generated HTML, PostScript or PDF produced by some word
+     processors for output purposes only.
+
+     The “Title Page” means, for a printed book, the title page itself,
+     plus such following pages as are needed to hold, legibly, the
+     material this License requires to appear in the title page.  For
+     works in formats which do not have any title page as such, “Title
+     Page” means the text near the most prominent appearance of the
+     work’s title, preceding the beginning of the body of the text.
+
+     The “publisher” means any person or entity that distributes copies
+     of the Document to the public.
+
+     A section “Entitled XYZ” means a named subunit of the Document
+     whose title either is precisely XYZ or contains XYZ in parentheses
+     following text that translates XYZ in another language.  (Here XYZ
+     stands for a specific section name mentioned below, such as
+     “Acknowledgements”, “Dedications”, “Endorsements”, or “History”.)
+     To “Preserve the Title” of such a section when you modify the
+     Document means that it remains a section “Entitled XYZ” according
+     to this definition.
+
+     The Document may include Warranty Disclaimers next to the notice
+     which states that this License applies to the Document.  These
+     Warranty Disclaimers are considered to be included by reference in
+     this License, but only as regards disclaiming warranties: any other
+     implication that these Warranty Disclaimers may have is void and
+     has no effect on the meaning of this License.
+
+  2. VERBATIM COPYING
+
+     You may copy and distribute the Document in any medium, either
+     commercially or noncommercially, provided that this License, the
+     copyright notices, and the license notice saying this License
+     applies to the Document are reproduced in all copies, and that you
+     add no other conditions whatsoever to those of this License.  You
+     may not use technical measures to obstruct or control the reading
+     or further copying of the copies you make or distribute.  However,
+     you may accept compensation in exchange for copies.  If you
+     distribute a large enough number of copies you must also follow the
+     conditions in section 3.
+
+     You may also lend copies, under the same conditions stated above,
+     and you may publicly display copies.
+
+  3. COPYING IN QUANTITY
+
+     If you publish printed copies (or copies in media that commonly
+     have printed covers) of the Document, numbering more than 100, and
+     the Document’s license notice requires Cover Texts, you must
+     enclose the copies in covers that carry, clearly and legibly, all
+     these Cover Texts: Front-Cover Texts on the front cover, and
+     Back-Cover Texts on the back cover.  Both covers must also clearly
+     and legibly identify you as the publisher of these copies.  The
+     front cover must present the full title with all words of the title
+     equally prominent and visible.  You may add other material on the
+     covers in addition.  Copying with changes limited to the covers, as
+     long as they preserve the title of the Document and satisfy these
+     conditions, can be treated as verbatim copying in other respects.
+
+     If the required texts for either cover are too voluminous to fit
+     legibly, you should put the first ones listed (as many as fit
+     reasonably) on the actual cover, and continue the rest onto
+     adjacent pages.
+
+     If you publish or distribute Opaque copies of the Document
+     numbering more than 100, you must either include a machine-readable
+     Transparent copy along with each Opaque copy, or state in or with
+     each Opaque copy a computer-network location from which the general
+     network-using public has access to download using public-standard
+     network protocols a complete Transparent copy of the Document, free
+     of added material.  If you use the latter option, you must take
+     reasonably prudent steps, when you begin distribution of Opaque
+     copies in quantity, to ensure that this Transparent copy will
+     remain thus accessible at the stated location until at least one
+     year after the last time you distribute an Opaque copy (directly or
+     through your agents or retailers) of that edition to the public.
+
+     It is requested, but not required, that you contact the authors of
+     the Document well before redistributing any large number of copies,
+     to give them a chance to provide you with an updated version of the
+     Document.
+
+  4. MODIFICATIONS
+
+     You may copy and distribute a Modified Version of the Document
+     under the conditions of sections 2 and 3 above, provided that you
+     release the Modified Version under precisely this License, with the
+     Modified Version filling the role of the Document, thus licensing
+     distribution and modification of the Modified Version to whoever
+     possesses a copy of it.  In addition, you must do these things in
+     the Modified Version:
+
+       A. Use in the Title Page (and on the covers, if any) a title
+          distinct from that of the Document, and from those of previous
+          versions (which should, if there were any, be listed in the
+          History section of the Document).  You may use the same title
+          as a previous version if the original publisher of that
+          version gives permission.
+
+       B. List on the Title Page, as authors, one or more persons or
+          entities responsible for authorship of the modifications in
+          the Modified Version, together with at least five of the
+          principal authors of the Document (all of its principal
+          authors, if it has fewer than five), unless they release you
+          from this requirement.
+
+       C. State on the Title page the name of the publisher of the
+          Modified Version, as the publisher.
+
+       D. Preserve all the copyright notices of the Document.
+
+       E. Add an appropriate copyright notice for your modifications
+          adjacent to the other copyright notices.
+
+       F. Include, immediately after the copyright notices, a license
+          notice giving the public permission to use the Modified
+          Version under the terms of this License, in the form shown in
+          the Addendum below.
+
+       G. Preserve in that license notice the full lists of Invariant
+          Sections and required Cover Texts given in the Document’s
+          license notice.
+
+       H. Include an unaltered copy of this License.
+
+       I. Preserve the section Entitled “History”, Preserve its Title,
+          and add to it an item stating at least the title, year, new
+          authors, and publisher of the Modified Version as given on the
+          Title Page.  If there is no section Entitled “History” in the
+          Document, create one stating the title, year, authors, and
+          publisher of the Document as given on its Title Page, then add
+          an item describing the Modified Version as stated in the
+          previous sentence.
+
+       J. Preserve the network location, if any, given in the Document
+          for public access to a Transparent copy of the Document, and
+          likewise the network locations given in the Document for
+          previous versions it was based on.  These may be placed in the
+          “History” section.  You may omit a network location for a work
+          that was published at least four years before the Document
+          itself, or if the original publisher of the version it refers
+          to gives permission.
+
+       K. For any section Entitled “Acknowledgements” or “Dedications”,
+          Preserve the Title of the section, and preserve in the section
+          all the substance and tone of each of the contributor
+          acknowledgements and/or dedications given therein.
+
+       L. Preserve all the Invariant Sections of the Document, unaltered
+          in their text and in their titles.  Section numbers or the
+          equivalent are not considered part of the section titles.
+
+       M. Delete any section Entitled “Endorsements”.  Such a section
+          may not be included in the Modified Version.
+
+       N. Do not retitle any existing section to be Entitled
+          “Endorsements” or to conflict in title with any Invariant
+          Section.
+
+       O. Preserve any Warranty Disclaimers.
+
+     If the Modified Version includes new front-matter sections or
+     appendices that qualify as Secondary Sections and contain no
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+     some or all of these sections as invariant.  To do this, add their
+     titles to the list of Invariant Sections in the Modified Version’s
+     license notice.  These titles must be distinct from any other
+     section titles.
+
+     You may add a section Entitled “Endorsements”, provided it contains
+     nothing but endorsements of your Modified Version by various
+     parties—for example, statements of peer review or that the text has
+     been approved by an organization as the authoritative definition of
+     a standard.
+
+     You may add a passage of up to five words as a Front-Cover Text,
+     and a passage of up to 25 words as a Back-Cover Text, to the end of
+     the list of Cover Texts in the Modified Version.  Only one passage
+     of Front-Cover Text and one of Back-Cover Text may be added by (or
+     through arrangements made by) any one entity.  If the Document
+     already includes a cover text for the same cover, previously added
+     by you or by arrangement made by the same entity you are acting on
+     behalf of, you may not add another; but you may replace the old
+     one, on explicit permission from the previous publisher that added
+     the old one.
+
+     The author(s) and publisher(s) of the Document do not by this
+     License give permission to use their names for publicity for or to
+     assert or imply endorsement of any Modified Version.
+
+  5. COMBINING DOCUMENTS
+
+     You may combine the Document with other documents released under
+     this License, under the terms defined in section 4 above for
+     modified versions, provided that you include in the combination all
+     of the Invariant Sections of all of the original documents,
+     unmodified, and list them all as Invariant Sections of your
+     combined work in its license notice, and that you preserve all
+     their Warranty Disclaimers.
+
+     The combined work need only contain one copy of this License, and
+     multiple identical Invariant Sections may be replaced with a single
+     copy.  If there are multiple Invariant Sections with the same name
+     but different contents, make the title of each such section unique
+     by adding at the end of it, in parentheses, the name of the
+     original author or publisher of that section if known, or else a
+     unique number.  Make the same adjustment to the section titles in
+     the list of Invariant Sections in the license notice of the
+     combined work.
+
+     In the combination, you must combine any sections Entitled
+     “History” in the various original documents, forming one section
+     Entitled “History”; likewise combine any sections Entitled
+     “Acknowledgements”, and any sections Entitled “Dedications”.  You
+     must delete all sections Entitled “Endorsements.”
+
+  6. COLLECTIONS OF DOCUMENTS
+
+     You may make a collection consisting of the Document and other
+     documents released under this License, and replace the individual
+     copies of this License in the various documents with a single copy
+     that is included in the collection, provided that you follow the
+     rules of this License for verbatim copying of each of the documents
+     in all other respects.
+
+     You may extract a single document from such a collection, and
+     distribute it individually under this License, provided you insert
+     a copy of this License into the extracted document, and follow this
+     License in all other respects regarding verbatim copying of that
+     document.
+
+  7. AGGREGATION WITH INDEPENDENT WORKS
+
+     A compilation of the Document or its derivatives with other
+     separate and independent documents or works, in or on a volume of a
+     storage or distribution medium, is called an “aggregate” if the
+     copyright resulting from the compilation is not used to limit the
+     legal rights of the compilation’s users beyond what the individual
+     works permit.  When the Document is included in an aggregate, this
+     License does not apply to the other works in the aggregate which
+     are not themselves derivative works of the Document.
+
+     If the Cover Text requirement of section 3 is applicable to these
+     copies of the Document, then if the Document is less than one half
+     of the entire aggregate, the Document’s Cover Texts may be placed
+     on covers that bracket the Document within the aggregate, or the
+     electronic equivalent of covers if the Document is in electronic
+     form.  Otherwise they must appear on printed covers that bracket
+     the whole aggregate.
+
+  8. TRANSLATION
+
+     Translation is considered a kind of modification, so you may
+     distribute translations of the Document under the terms of section
+     4.  Replacing Invariant Sections with translations requires special
+     permission from their copyright holders, but you may include
+     translations of some or all Invariant Sections in addition to the
+     original versions of these Invariant Sections.  You may include a
+     translation of this License, and all the license notices in the
+     Document, and any Warranty Disclaimers, provided that you also
+     include the original English version of this License and the
+     original versions of those notices and disclaimers.  In case of a
+     disagreement between the translation and the original version of
+     this License or a notice or disclaimer, the original version will
+     prevail.
+
+     If a section in the Document is Entitled “Acknowledgements”,
+     “Dedications”, or “History”, the requirement (section 4) to
+     Preserve its Title (section 1) will typically require changing the
+     actual title.
+
+  9. TERMINATION
+
+     You may not copy, modify, sublicense, or distribute the Document
+     except as expressly provided under this License.  Any attempt
+     otherwise to copy, modify, sublicense, or distribute it is void,
+     and will automatically terminate your rights under this License.
+
+     However, if you cease all violation of this License, then your
+     license from a particular copyright holder is reinstated (a)
+     provisionally, unless and until the copyright holder explicitly and
+     finally terminates your license, and (b) permanently, if the
+     copyright holder fails to notify you of the violation by some
+     reasonable means prior to 60 days after the cessation.
+
+     Moreover, your license from a particular copyright holder is
+     reinstated permanently if the copyright holder notifies you of the
+     violation by some reasonable means, this is the first time you have
+     received notice of violation of this License (for any work) from
+     that copyright holder, and you cure the violation prior to 30 days
+     after your receipt of the notice.
+
+     Termination of your rights under this section does not terminate
+     the licenses of parties who have received copies or rights from you
+     under this License.  If your rights have been terminated and not
+     permanently reinstated, receipt of a copy of some or all of the
+     same material does not give you any rights to use it.
+
+  10. FUTURE REVISIONS OF THIS LICENSE
+
+     The Free Software Foundation may publish new, revised versions of
+     the GNU Free Documentation License from time to time.  Such new
+     versions will be similar in spirit to the present version, but may
+     differ in detail to address new problems or concerns.  See
+     <https://www.gnu.org/licenses/>.
+
+     Each version of the License is given a distinguishing version
+     number.  If the Document specifies that a particular numbered
+     version of this License “or any later version” applies to it, you
+     have the option of following the terms and conditions either of
+     that specified version or of any later version that has been
+     published (not as a draft) by the Free Software Foundation.  If the
+     Document does not specify a version number of this License, you may
+     choose any version ever published (not as a draft) by the Free
+     Software Foundation.  If the Document specifies that a proxy can
+     decide which future versions of this License can be used, that
+     proxy’s public statement of acceptance of a version permanently
+     authorizes you to choose that version for the Document.
+
+  11. RELICENSING
+
+     “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any
+     World Wide Web server that publishes copyrightable works and also
+     provides prominent facilities for anybody to edit those works.  A
+     public wiki that anybody can edit is an example of such a server.
+     A “Massive Multiauthor Collaboration” (or “MMC”) contained in the
+     site means any set of copyrightable works thus published on the MMC
+     site.
+
+     “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0
+     license published by Creative Commons Corporation, a not-for-profit
+     corporation with a principal place of business in San Francisco,
+     California, as well as future copyleft versions of that license
+     published by that same organization.
+
+     “Incorporate” means to publish or republish a Document, in whole or
+     in part, as part of another Document.
+
+     An MMC is “eligible for relicensing” if it is licensed under this
+     License, and if all works that were first published under this
+     License somewhere other than this MMC, and subsequently
+     incorporated in whole or in part into the MMC, (1) had no cover
+     texts or invariant sections, and (2) were thus incorporated prior
+     to November 1, 2008.
+
+     The operator of an MMC Site may republish an MMC contained in the
+     site under CC-BY-SA on the same site at any time before August 1,
+     2009, provided the MMC is eligible for relicensing.
+
+ADDENDUM: How to use this License for your documents
+====================================================
+
+To use this License in a document you have written, include a copy of
+the License in the document and put the following copyright and license
+notices just after the title page:
+
+       Copyright (C)  YEAR  YOUR NAME.
+       Permission is granted to copy, distribute and/or modify this document
+       under the terms of the GNU Free Documentation License, Version 1.3
+       or any later version published by the Free Software Foundation;
+       with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
+       Texts.  A copy of the license is included in the section entitled ``GNU
+       Free Documentation License''.
+
+   If you have Invariant Sections, Front-Cover Texts and Back-Cover
+Texts, replace the “with...Texts.” line with this:
+
+         with the Invariant Sections being LIST THEIR TITLES, with
+         the Front-Cover Texts being LIST, and with the Back-Cover Texts
+         being LIST.
+
+   If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+   If your document contains nontrivial examples of program code, we
+recommend releasing these examples in parallel under your choice of free
+software license, such as the GNU General Public License, to permit
+their use in free software.
+
+
+File: grep.info,  Node: Index,  Prev: Copying,  Up: Top
+
+Index
+*****
+
+
+* Menu:
+
+* *:                                     Fundamental Structure.
+                                                              (line  22)
+* +:                                     Fundamental Structure.
+                                                              (line  25)
+* --:                                    Other Options.       (line   7)
+* --after-context:                       Context Line Control.
+                                                              (line  15)
+* --basic-regexp:                        grep Programs.       (line  15)
+* --before-context:                      Context Line Control.
+                                                              (line  19)
+* --binary:                              Other Options.       (line  22)
+* --binary-files:                        File and Directory Selection.
+                                                              (line  12)
+* --byte-offset:                         Output Line Prefix Control.
+                                                              (line  12)
+* --color:                               General Output Control.
+                                                              (line  14)
+* --colour:                              General Output Control.
+                                                              (line  14)
+* --context:                             Context Line Control.
+                                                              (line  24)
+* --count:                               General Output Control.
+                                                              (line   8)
+* --dereference-recursive:               File and Directory Selection.
+                                                              (line 113)
+* --devices:                             File and Directory Selection.
+                                                              (line  51)
+* --directories:                         File and Directory Selection.
+                                                              (line  62)
+* --exclude:                             File and Directory Selection.
+                                                              (line  73)
+* --exclude-dir:                         File and Directory Selection.
+                                                              (line  87)
+* --exclude-from:                        File and Directory Selection.
+                                                              (line  83)
+* --extended-regexp:                     grep Programs.       (line  20)
+* --file:                                Matching Control.    (line  17)
+* --files-with-matches:                  General Output Control.
+                                                              (line  34)
+* --files-without-match:                 General Output Control.
+                                                              (line  29)
+* --fixed-strings:                       grep Programs.       (line  25)
+* --group-separator:                     Context Line Control.
+                                                              (line  27)
+* --group-separator <1>:                 Context Line Control.
+                                                              (line  31)
+* --help:                                Generic Program Information.
+                                                              (line   7)
+* --ignore-case:                         Matching Control.    (line  26)
+* --include:                             File and Directory Selection.
+                                                              (line  97)
+* --initial-tab:                         Output Line Prefix Control.
+                                                              (line  41)
+* --invert-match:                        Matching Control.    (line  51)
+* --label:                               Output Line Prefix Control.
+                                                              (line  28)
+* --line-buffered:                       Other Options.       (line  13)
+* --line-number:                         Output Line Prefix Control.
+                                                              (line  36)
+* --line-regexp:                         Matching Control.    (line  73)
+* --max-count:                           General Output Control.
+                                                              (line  40)
+* --no-filename:                         Output Line Prefix Control.
+                                                              (line  23)
+* --no-ignore-case:                      Matching Control.    (line  44)
+* --no-messages:                         General Output Control.
+                                                              (line  85)
+* --null:                                Output Line Prefix Control.
+                                                              (line  50)
+* --null-data:                           Other Options.       (line  43)
+* --only-matching:                       General Output Control.
+                                                              (line  70)
+* --perl-regexp:                         grep Programs.       (line  30)
+* --quiet:                               General Output Control.
+                                                              (line  78)
+* --recursive:                           File and Directory Selection.
+                                                              (line 105)
+* --regexp=PATTERNS:                     Matching Control.    (line   8)
+* --silent:                              General Output Control.
+                                                              (line  78)
+* --text:                                File and Directory Selection.
+                                                              (line   8)
+* --version:                             Generic Program Information.
+                                                              (line  12)
+* --with-filename:                       Output Line Prefix Control.
+                                                              (line  18)
+* --word-regexp:                         Matching Control.    (line  56)
+* -A:                                    Context Line Control.
+                                                              (line  15)
+* -a:                                    File and Directory Selection.
+                                                              (line   8)
+* -b:                                    Output Line Prefix Control.
+                                                              (line  12)
+* -B:                                    Context Line Control.
+                                                              (line  19)
+* -c:                                    General Output Control.
+                                                              (line   8)
+* -C:                                    Context Line Control.
+                                                              (line  24)
+* -D:                                    File and Directory Selection.
+                                                              (line  51)
+* -d:                                    File and Directory Selection.
+                                                              (line  62)
+* -e:                                    Matching Control.    (line   8)
+* -E:                                    grep Programs.       (line  20)
+* -f:                                    Matching Control.    (line  17)
+* -F:                                    grep Programs.       (line  25)
+* -G:                                    grep Programs.       (line  15)
+* -H:                                    Output Line Prefix Control.
+                                                              (line  18)
+* -h:                                    Output Line Prefix Control.
+                                                              (line  23)
+* -i:                                    Matching Control.    (line  26)
+* -L:                                    General Output Control.
+                                                              (line  29)
+* -l:                                    General Output Control.
+                                                              (line  34)
+* -m:                                    General Output Control.
+                                                              (line  40)
+* -n:                                    Output Line Prefix Control.
+                                                              (line  36)
+* -NUM:                                  Context Line Control.
+                                                              (line  24)
+* -o:                                    General Output Control.
+                                                              (line  70)
+* -P:                                    grep Programs.       (line  30)
+* -q:                                    General Output Control.
+                                                              (line  78)
+* -r:                                    File and Directory Selection.
+                                                              (line 105)
+* -R:                                    File and Directory Selection.
+                                                              (line 113)
+* -s:                                    General Output Control.
+                                                              (line  85)
+* -T:                                    Output Line Prefix Control.
+                                                              (line  41)
+* -U:                                    Other Options.       (line  22)
+* -V:                                    Generic Program Information.
+                                                              (line  12)
+* -v:                                    Matching Control.    (line  51)
+* -w:                                    Matching Control.    (line  56)
+* -x:                                    Matching Control.    (line  73)
+* -y:                                    Matching Control.    (line  26)
+* -Z:                                    Output Line Prefix Control.
+                                                              (line  50)
+* -z:                                    Other Options.       (line  43)
+* .:                                     Fundamental Structure.
+                                                              (line  11)
+* ?:                                     Fundamental Structure.
+                                                              (line  19)
+* _N_GNU_nonoption_argv_flags_ environment variable: Environment Variables.
+                                                              (line 178)
+* {,M}:                                  Fundamental Structure.
+                                                              (line  34)
+* {N,M}:                                 Fundamental Structure.
+                                                              (line  38)
+* {N,}:                                  Fundamental Structure.
+                                                              (line  31)
+* {N}:                                   Fundamental Structure.
+                                                              (line  28)
+* after context:                         Context Line Control.
+                                                              (line  15)
+* alnum character class:                 Character Classes and Bracket Expressions.
+                                                              (line  31)
+* alpha character class:                 Character Classes and Bracket Expressions.
+                                                              (line  36)
+* alphabetic characters:                 Character Classes and Bracket Expressions.
+                                                              (line  36)
+* alphanumeric characters:               Character Classes and Bracket Expressions.
+                                                              (line  31)
+* anchoring:                             Anchoring.           (line   6)
+* asterisk:                              Fundamental Structure.
+                                                              (line  22)
+* back-reference:                        Back-references and Subexpressions.
+                                                              (line   6)
+* back-references:                       Performance.         (line  32)
+* backslash:                             The Backslash Character and Special Expressions.
+                                                              (line   6)
+* basic regular expressions:             Basic vs Extended.   (line   6)
+* before context:                        Context Line Control.
+                                                              (line  19)
+* binary files:                          File and Directory Selection.
+                                                              (line   8)
+* binary files <1>:                      File and Directory Selection.
+                                                              (line  12)
+* binary I/O:                            Other Options.       (line  22)
+* blank character class:                 Character Classes and Bracket Expressions.
+                                                              (line  41)
+* blank characters:                      Character Classes and Bracket Expressions.
+                                                              (line  41)
+* bn GREP_COLORS capability:             Environment Variables.
+                                                              (line 121)
+* braces, first argument omitted:        Fundamental Structure.
+                                                              (line  34)
+* braces, one argument:                  Fundamental Structure.
+                                                              (line  28)
+* braces, second argument omitted:       Fundamental Structure.
+                                                              (line  31)
+* braces, two arguments:                 Fundamental Structure.
+                                                              (line  38)
+* bracket expression:                    Character Classes and Bracket Expressions.
+                                                              (line   6)
+* Bugs, known:                           Known Bugs.          (line   6)
+* bugs, reporting:                       Reporting Bugs.      (line   6)
+* byte offset:                           Output Line Prefix Control.
+                                                              (line  12)
+* case insensitive search:               Matching Control.    (line  26)
+* case insensitive search <1>:           Performance.         (line  27)
+* changing name of standard input:       Output Line Prefix Control.
+                                                              (line  28)
+* character class:                       Character Classes and Bracket Expressions.
+                                                              (line   6)
+* character classes:                     Character Classes and Bracket Expressions.
+                                                              (line  30)
+* character encoding:                    Character Encoding.  (line   6)
+* character type:                        Environment Variables.
+                                                              (line 148)
+* classes of characters:                 Character Classes and Bracket Expressions.
+                                                              (line  30)
+* cntrl character class:                 Character Classes and Bracket Expressions.
+                                                              (line  44)
+* context lines:                         General Output Control.
+                                                              (line  62)
+* context lines <1>:                     Context Line Control.
+                                                              (line   6)
+* context lines <2>:                     Context Line Control.
+                                                              (line  24)
+* context lines, after match:            Context Line Control.
+                                                              (line  15)
+* context lines, before match:           Context Line Control.
+                                                              (line  19)
+* control characters:                    Character Classes and Bracket Expressions.
+                                                              (line  44)
+* copying:                               Copying.             (line   6)
+* counting lines:                        General Output Control.
+                                                              (line   8)
+* cx GREP_COLORS capability:             Environment Variables.
+                                                              (line  72)
+* device search:                         File and Directory Selection.
+                                                              (line  51)
+* digit character class:                 Character Classes and Bracket Expressions.
+                                                              (line  49)
+* digit characters:                      Character Classes and Bracket Expressions.
+                                                              (line  49)
+* directory search:                      File and Directory Selection.
+                                                              (line  62)
+* dot:                                   Fundamental Structure.
+                                                              (line  11)
+* encoding error:                        Environment Variables.
+                                                              (line 155)
+* environment variables:                 Environment Variables.
+                                                              (line  44)
+* exclude directories:                   File and Directory Selection.
+                                                              (line  87)
+* exclude files:                         File and Directory Selection.
+                                                              (line  73)
+* exclude files <1>:                     File and Directory Selection.
+                                                              (line  83)
+* exit status:                           Exit Status.         (line   6)
+* FAQ about grep usage:                  Usage.               (line  32)
+* files which don’t match:               General Output Control.
+                                                              (line  29)
+* fn GREP_COLORS capability:             Environment Variables.
+                                                              (line 111)
+* fn GREP_COLORS capability <1>:         Environment Variables.
+                                                              (line 126)
+* graph character class:                 Character Classes and Bracket Expressions.
+                                                              (line  52)
+* graphic characters:                    Character Classes and Bracket Expressions.
+                                                              (line  52)
+* grep programs:                         grep Programs.       (line   6)
+* GREP_COLOR environment variable:       Environment Variables.
+                                                              (line  45)
+* GREP_COLORS environment variable:      Environment Variables.
+                                                              (line  56)
+* group separator:                       Context Line Control.
+                                                              (line  27)
+* group separator <1>:                   Context Line Control.
+                                                              (line  31)
+* hexadecimal digits:                    Character Classes and Bracket Expressions.
+                                                              (line  76)
+* highlight markers:                     Environment Variables.
+                                                              (line  45)
+* highlight markers <1>:                 Environment Variables.
+                                                              (line  56)
+* highlight, color, colour:              General Output Control.
+                                                              (line  14)
+* holes in files:                        Performance.         (line  42)
+* include files:                         File and Directory Selection.
+                                                              (line  97)
+* interval expressions:                  Fundamental Structure.
+                                                              (line  14)
+* interval expressions <1>:              Basic vs Extended.   (line  27)
+* invert matching:                       Matching Control.    (line  51)
+* LANG environment variable:             Environment Variables.
+                                                              (line   9)
+* LANG environment variable <1>:         Environment Variables.
+                                                              (line 148)
+* LANG environment variable <2>:         Environment Variables.
+                                                              (line 155)
+* LANG environment variable <3>:         Environment Variables.
+                                                              (line 164)
+* LANGUAGE environment variable:         Environment Variables.
+                                                              (line   9)
+* LANGUAGE environment variable <1>:     Environment Variables.
+                                                              (line 164)
+* language of messages:                  Environment Variables.
+                                                              (line 164)
+* LC_ALL environment variable:           Environment Variables.
+                                                              (line   9)
+* LC_ALL environment variable <1>:       Environment Variables.
+                                                              (line 148)
+* LC_ALL environment variable <2>:       Environment Variables.
+                                                              (line 155)
+* LC_ALL environment variable <3>:       Environment Variables.
+                                                              (line 164)
+* LC_COLLATE environment variable:       Environment Variables.
+                                                              (line 148)
+* LC_CTYPE environment variable:         Environment Variables.
+                                                              (line 155)
+* LC_MESSAGES environment variable:      Environment Variables.
+                                                              (line   9)
+* LC_MESSAGES environment variable <1>:  Environment Variables.
+                                                              (line 164)
+* line buffering:                        Other Options.       (line  13)
+* line numbering:                        Output Line Prefix Control.
+                                                              (line  36)
+* ln GREP_COLORS capability:             Environment Variables.
+                                                              (line 116)
+* locales:                               Performance.         (line  20)
+* lower character class:                 Character Classes and Bracket Expressions.
+                                                              (line  55)
+* lower-case letters:                    Character Classes and Bracket Expressions.
+                                                              (line  55)
+* match expression at most M times:      Fundamental Structure.
+                                                              (line  34)
+* match expression at most once:         Fundamental Structure.
+                                                              (line  19)
+* match expression from N to M times:    Fundamental Structure.
+                                                              (line  38)
+* match expression N or more times:      Fundamental Structure.
+                                                              (line  31)
+* match expression N times:              Fundamental Structure.
+                                                              (line  28)
+* match expression one or more times:    Fundamental Structure.
+                                                              (line  25)
+* match expression zero or more times:   Fundamental Structure.
+                                                              (line  22)
+* match the whole line:                  Matching Control.    (line  73)
+* matching basic regular expressions:    grep Programs.       (line  15)
+* matching extended regular expressions: grep Programs.       (line  20)
+* matching fixed strings:                grep Programs.       (line  25)
+* matching Perl-compatible regular expressions: grep Programs.
+                                                              (line  30)
+* matching whole words:                  Matching Control.    (line  56)
+* max-count:                             General Output Control.
+                                                              (line  40)
+* mc GREP_COLORS capability:             Environment Variables.
+                                                              (line 103)
+* message language:                      Environment Variables.
+                                                              (line 164)
+* ms GREP_COLORS capability:             Environment Variables.
+                                                              (line  95)
+* MS-Windows binary I/O:                 Other Options.       (line  22)
+* mt GREP_COLORS capability:             Environment Variables.
+                                                              (line  87)
+* names of matching files:               General Output Control.
+                                                              (line  34)
+* national language support:             Environment Variables.
+                                                              (line 148)
+* national language support <1>:         Environment Variables.
+                                                              (line 164)
+* ne GREP_COLORS capability:             Environment Variables.
+                                                              (line 133)
+* NLS:                                   Environment Variables.
+                                                              (line 148)
+* no filename prefix:                    Output Line Prefix Control.
+                                                              (line  23)
+* non-ASCII matching:                    Matching Non-ASCII.  (line   6)
+* non-printable matching:                Matching Non-ASCII.  (line   6)
+* null character:                        Environment Variables.
+                                                              (line 155)
+* numeric characters:                    Character Classes and Bracket Expressions.
+                                                              (line  49)
+* only matching:                         General Output Control.
+                                                              (line  70)
+* option delimiter:                      Other Options.       (line   7)
+* ordinary characters:                   Fundamental Structure.
+                                                              (line   6)
+* patterns from file:                    Matching Control.    (line  17)
+* patterns option:                       Matching Control.    (line   8)
+* performance:                           Performance.         (line   6)
+* period:                                Fundamental Structure.
+                                                              (line  11)
+* plus sign:                             Fundamental Structure.
+                                                              (line  25)
+* POSIXLY_CORRECT environment variable:  Environment Variables.
+                                                              (line 169)
+* print character class:                 Character Classes and Bracket Expressions.
+                                                              (line  59)
+* print non-matching lines:              Matching Control.    (line  51)
+* printable characters:                  Character Classes and Bracket Expressions.
+                                                              (line  59)
+* punct character class:                 Character Classes and Bracket Expressions.
+                                                              (line  62)
+* punctuation characters:                Character Classes and Bracket Expressions.
+                                                              (line  62)
+* question mark:                         Fundamental Structure.
+                                                              (line  19)
+* quiet, silent:                         General Output Control.
+                                                              (line  78)
+* range expression:                      Character Classes and Bracket Expressions.
+                                                              (line  14)
+* recursive search:                      File and Directory Selection.
+                                                              (line 105)
+* recursive search <1>:                  File and Directory Selection.
+                                                              (line 113)
+* regular expressions:                   Regular Expressions. (line   6)
+* return status:                         Exit Status.         (line   6)
+* rv GREP_COLORS capability:             Environment Variables.
+                                                              (line  81)
+* searching directory trees:             File and Directory Selection.
+                                                              (line  73)
+* searching directory trees <1>:         File and Directory Selection.
+                                                              (line  83)
+* searching directory trees <2>:         File and Directory Selection.
+                                                              (line  97)
+* searching directory trees <3>:         File and Directory Selection.
+                                                              (line 105)
+* searching directory trees <4>:         File and Directory Selection.
+                                                              (line 113)
+* searching for patterns:                Introduction.        (line   6)
+* sl GREP_COLORS capability:             Environment Variables.
+                                                              (line  64)
+* space character class:                 Character Classes and Bracket Expressions.
+                                                              (line  67)
+* space characters:                      Character Classes and Bracket Expressions.
+                                                              (line  67)
+* special characters:                    Fundamental Structure.
+                                                              (line   6)
+* subexpression:                         Back-references and Subexpressions.
+                                                              (line   6)
+* suppress binary data:                  File and Directory Selection.
+                                                              (line   8)
+* suppress error messages:               General Output Control.
+                                                              (line  85)
+* symbolic links:                        File and Directory Selection.
+                                                              (line  62)
+* symbolic links <1>:                    File and Directory Selection.
+                                                              (line 105)
+* symbolic links <2>:                    File and Directory Selection.
+                                                              (line 113)
+* tab-aligned content lines:             Output Line Prefix Control.
+                                                              (line  41)
+* translation of message language:       Environment Variables.
+                                                              (line 164)
+* upper character class:                 Character Classes and Bracket Expressions.
+                                                              (line  72)
+* upper-case letters:                    Character Classes and Bracket Expressions.
+                                                              (line  72)
+* usage summary, printing:               Generic Program Information.
+                                                              (line   7)
+* usage, examples:                       Usage.               (line   6)
+* using grep, Q&A:                       Usage.               (line  32)
+* variants of grep:                      grep Programs.       (line   6)
+* version, printing:                     Generic Program Information.
+                                                              (line  12)
+* whitespace characters:                 Character Classes and Bracket Expressions.
+                                                              (line  67)
+* with filename prefix:                  Output Line Prefix Control.
+                                                              (line  18)
+* xdigit character class:                Character Classes and Bracket Expressions.
+                                                              (line  76)
+* xdigit class:                          Character Classes and Bracket Expressions.
+                                                              (line  76)
+* zero-terminated file names:            Output Line Prefix Control.
+                                                              (line  50)
+* zero-terminated lines:                 Other Options.       (line  43)
+
+
+
+Tag Table:
+Node: Top773
+Node: Introduction1965
+Node: Invoking2708
+Node: Command-line Options3551
+Node: Generic Program Information4434
+Node: Matching Control4908
+Node: General Output Control8537
+Ref: General Output Control-Footnote-112636
+Node: Output Line Prefix Control12705
+Node: Context Line Control15061
+Node: File and Directory Selection17124
+Node: Other Options22916
+Node: Environment Variables25129
+Node: Exit Status35125
+Node: grep Programs35603
+Node: Regular Expressions37234
+Node: Fundamental Structure38475
+Node: Character Classes and Bracket Expressions40359
+Ref: invalid-bracket-expr43984
+Node: The Backslash Character and Special Expressions45222
+Node: Anchoring46413
+Node: Back-references and Subexpressions46875
+Node: Basic vs Extended47879
+Node: Character Encoding49888
+Node: Matching Non-ASCII51354
+Node: Usage53481
+Node: Performance61173
+Node: Reporting Bugs64873
+Node: Known Bugs65250
+Node: Copying66321
+Node: GNU Free Documentation License67449
+Node: Index92754
+
+End Tag Table
+
+
+Local Variables:
+coding: utf-8
+End:
diff --git a/src/grep/doc/grep.texi b/src/grep/doc/grep.texi
new file mode 100644
index 0000000..01ac81e
--- /dev/null
+++ b/src/grep/doc/grep.texi
@@ -0,0 +1,2109 @@
+\input texinfo  @c -*-texinfo-*-
+@c %**start of header
+@setfilename grep.info
+@include version.texi
+@settitle GNU Grep @value{VERSION}
+
+@c Combine indices.
+@syncodeindex ky cp
+@syncodeindex pg cp
+@syncodeindex tp cp
+@defcodeindex op
+@syncodeindex op cp
+@syncodeindex vr cp
+@c %**end of header
+
+@documentencoding UTF-8
+@c These two require Texinfo 5.0 or later, so use the older
+@c equivalent @set variables supported in 4.11 and later.
+@ignore
+@codequotebacktick on
+@codequoteundirected on
+@end ignore
+@set txicodequoteundirected
+@set txicodequotebacktick
+@iftex
+@c TeX sometimes fails to hyphenate, so help it here.
+@hyphenation{spec-i-fied}
+@end iftex
+
+@copying
+This manual is for @command{grep}, a pattern matching engine.
+
+Copyright @copyright{} 1999--2002, 2005, 2008--2021 Free Software Foundation,
+Inc.
+
+@quotation
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
+Texts.  A copy of the license is included in the section entitled
+``GNU Free Documentation License''.
+@end quotation
+@end copying
+
+@dircategory Text creation and manipulation
+@direntry
+* grep: (grep).                 Print lines that match patterns.
+@end direntry
+
+@titlepage
+@title GNU Grep: Print lines that match patterns
+@subtitle version @value{VERSION}, @value{UPDATED}
+@author Alain Magloire et al.
+@page
+@vskip 0pt plus 1filll
+@insertcopying
+@end titlepage
+
+@contents
+
+
+@ifnottex
+@node Top
+@top grep
+
+@command{grep} prints lines that contain a match for one or more patterns.
+
+This manual is for version @value{VERSION} of GNU Grep.
+
+@insertcopying
+@end ifnottex
+
+@menu
+* Introduction::                Introduction.
+* Invoking::                    Command-line options, environment, exit status.
+* Regular Expressions::         Regular Expressions.
+* Usage::                       Examples.
+* Performance::                 Performance tuning.
+* Reporting Bugs::              Reporting Bugs.
+* Copying::                     License terms for this manual.
+* Index::                       Combined index.
+@end menu
+
+
+@node Introduction
+@chapter Introduction
+
+@cindex searching for patterns
+
+Given one or more patterns, @command{grep} searches input files
+for matches to the patterns.
+When it finds a match in a line,
+it copies the line to standard output (by default),
+or produces whatever other sort of output you have requested with options.
+
+Though @command{grep} expects to do the matching on text,
+it has no limits on input line length other than available memory,
+and it can match arbitrary characters within a line.
+If the final byte of an input file is not a newline,
+@command{grep} silently supplies one.
+Since newline is also a separator for the list of patterns,
+there is no way to match newline characters in a text.
+
+
+@node Invoking
+@chapter Invoking @command{grep}
+
+The general synopsis of the @command{grep} command line is
+
+@example
+grep [@var{option}...] [@var{patterns}] [@var{file}...]
+@end example
+
+@noindent
+There can be zero or more @var{option} arguments, and zero or more
+@var{file} arguments.  The @var{patterns} argument contains one or
+more patterns separated by newlines, and is omitted when patterns are
+given via the @samp{-e@ @var{patterns}} or @samp{-f@ @var{file}}
+options.  Typically @var{patterns} should be quoted when
+@command{grep} is used in a shell command.
+
+@menu
+* Command-line Options::        Short and long names, grouped by category.
+* Environment Variables::       POSIX, GNU generic, and GNU grep specific.
+* Exit Status::                 Exit status returned by @command{grep}.
+* grep Programs::               @command{grep} programs.
+@end menu
+
+@node Command-line Options
+@section Command-line Options
+
+@command{grep} comes with a rich set of options:
+some from POSIX and some being GNU extensions.
+Long option names are always a GNU extension,
+even for options that are from POSIX specifications.
+Options that are specified by POSIX,
+under their short names,
+are explicitly marked as such
+to facilitate POSIX-portable programming.
+A few option names are provided
+for compatibility with older or more exotic implementations.
+
+@menu
+* Generic Program Information::
+* Matching Control::
+* General Output Control::
+* Output Line Prefix Control::
+* Context Line Control::
+* File and Directory Selection::
+* Other Options::
+@end menu
+
+Several additional options control
+which variant of the @command{grep} matching engine is used.
+@xref{grep Programs}.
+
+@node Generic Program Information
+@subsection Generic Program Information
+
+@table @option
+
+@item --help
+@opindex --help
+@cindex usage summary, printing
+Print a usage message briefly summarizing the command-line options
+and the bug-reporting address, then exit.
+
+@item -V
+@itemx --version
+@opindex -V
+@opindex --version
+@cindex version, printing
+Print the version number of @command{grep} to the standard output stream.
+This version number should be included in all bug reports.
+
+@end table
+
+@node Matching Control
+@subsection Matching Control
+
+@table @option
+
+@item -e @var{patterns}
+@itemx --regexp=@var{patterns}
+@opindex -e
+@opindex --regexp=@var{patterns}
+@cindex patterns option
+Use @var{patterns} as one or more patterns; newlines within
+@var{patterns} separate each pattern from the next.
+If this option is used multiple times or is combined with the
+@option{-f} (@option{--file}) option, search for all patterns given.
+Typically @var{patterns} should be quoted when @command{grep} is used
+in a shell command.
+(@option{-e} is specified by POSIX.)
+
+@item -f @var{file}
+@itemx --file=@var{file}
+@opindex -f
+@opindex --file
+@cindex patterns from file
+Obtain patterns from @var{file}, one per line.
+If this option is used multiple times or is combined with the
+@option{-e} (@option{--regexp}) option, search for all patterns given.
+The empty file contains zero patterns, and therefore matches nothing.
+(@option{-f} is specified by POSIX.)
+
+@item -i
+@itemx -y
+@itemx --ignore-case
+@opindex -i
+@opindex -y
+@opindex --ignore-case
+@cindex case insensitive search
+Ignore case distinctions in patterns and input data,
+so that characters that differ only in case
+match each other.  Although this is straightforward when letters
+differ in case only via lowercase-uppercase pairs, the behavior is
+unspecified in other situations.  For example, uppercase ``S'' has an
+unusual lowercase counterpart ``ſ'' (Unicode character U+017F, LATIN
+SMALL LETTER LONG S) in many locales, and it is unspecified whether
+this unusual character matches ``S'' or ``s'' even though uppercasing
+it yields ``S''.  Another example: the lowercase German letter ``ß''
+(U+00DF, LATIN SMALL LETTER SHARP S) is normally capitalized as the
+two-character string ``SS'' but it does not match ``SS'', and it might
+not match the uppercase letter ``ẞ'' (U+1E9E, LATIN CAPITAL LETTER
+SHARP S) even though lowercasing the latter yields the former.
+
+@option{-y} is an obsolete synonym that is provided for compatibility.
+(@option{-i} is specified by POSIX.)
+
+@item --no-ignore-case
+@opindex --no-ignore-case
+Do not ignore case distinctions in patterns and input data.  This is
+the default.  This option is useful for passing to shell scripts that
+already use @option{-i}, in order to cancel its effects because the
+two options override each other.
+
+@item -v
+@itemx --invert-match
+@opindex -v
+@opindex --invert-match
+@cindex invert matching
+@cindex print non-matching lines
+Invert the sense of matching, to select non-matching lines.
+(@option{-v} is specified by POSIX.)
+
+@item -w
+@itemx --word-regexp
+@opindex -w
+@opindex --word-regexp
+@cindex matching whole words
+Select only those lines containing matches that form whole words.
+The test is that the matching substring must either
+be at the beginning of the line,
+or preceded by a non-word constituent character.
+Similarly,
+it must be either at the end of the line
+or followed by a non-word constituent character.
+Word constituent characters are letters, digits, and the underscore.
+This option has no effect if @option{-x} is also specified.
+
+Because the @option{-w} option can match a substring that does not
+begin and end with word constituents, it differs from surrounding a
+regular expression with @samp{\<} and @samp{\>}.  For example, although
+@samp{grep -w @@} matches a line containing only @samp{@@}, @samp{grep
+'\<@@\>'} cannot match any line because @samp{@@} is not a
+word constituent.  @xref{The Backslash Character and Special
+Expressions}.
+
+@item -x
+@itemx --line-regexp
+@opindex -x
+@opindex --line-regexp
+@cindex match the whole line
+Select only those matches that exactly match the whole line.
+For regular expression patterns, this is like parenthesizing each
+pattern and then surrounding it with @samp{^} and @samp{$}.
+(@option{-x} is specified by POSIX.)
+
+@end table
+
+@node General Output Control
+@subsection General Output Control
+
+@table @option
+
+@item -c
+@itemx --count
+@opindex -c
+@opindex --count
+@cindex counting lines
+Suppress normal output;
+instead print a count of matching lines for each input file.
+With the @option{-v} (@option{--invert-match}) option,
+count non-matching lines.
+(@option{-c} is specified by POSIX.)
+
+@item --color[=@var{WHEN}]
+@itemx --colour[=@var{WHEN}]
+@opindex --color
+@opindex --colour
+@cindex highlight, color, colour
+Surround the matched (non-empty) strings, matching lines, context lines,
+file names, line numbers, byte offsets, and separators (for fields and
+groups of context lines) with escape sequences to display them in color
+on the terminal.
+The colors are defined by the environment variable @env{GREP_COLORS}
+and default to @samp{ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36}
+for bold red matched text, magenta file names, green line numbers,
+green byte offsets, cyan separators, and default terminal colors otherwise.
+The deprecated environment variable @env{GREP_COLOR} is still supported,
+but its setting does not have priority;
+it defaults to @samp{01;31} (bold red)
+which only covers the color for matched text.
+@var{WHEN} is @samp{never}, @samp{always}, or @samp{auto}.
+
+@item -L
+@itemx --files-without-match
+@opindex -L
+@opindex --files-without-match
+@cindex files which don't match
+Suppress normal output;
+instead print the name of each input file from which
+no output would normally have been printed.
+
+@item -l
+@itemx --files-with-matches
+@opindex -l
+@opindex --files-with-matches
+@cindex names of matching files
+Suppress normal output;
+instead print the name of each input file from which
+output would normally have been printed.
+Scanning each input file stops upon first match.
+(@option{-l} is specified by POSIX.)
+
+@item -m @var{num}
+@itemx --max-count=@var{num}
+@opindex -m
+@opindex --max-count
+@cindex max-count
+Stop after the first @var{num} selected lines.
+If the input is standard input from a regular file,
+and @var{num} selected lines are output,
+@command{grep} ensures that the standard input is positioned
+just after the last selected line before exiting,
+regardless of the presence of trailing context lines.
+This enables a calling process to resume a search.
+For example, the following shell script makes use of it:
+
+@example
+while grep -m 1 'PATTERN'
+do
+  echo xxxx
+done < FILE
+@end example
+
+But the following probably will not work because a pipe is not a regular
+file:
+
+@example
+# This probably will not work.
+cat FILE |
+while grep -m 1 'PATTERN'
+do
+  echo xxxx
+done
+@end example
+
+@cindex context lines
+When @command{grep} stops after @var{num} selected lines,
+it outputs any trailing context lines.
+When the @option{-c} or @option{--count} option is also used,
+@command{grep} does not output a count greater than @var{num}.
+When the @option{-v} or @option{--invert-match} option is also used,
+@command{grep} stops after outputting @var{num} non-matching lines.
+
+@item -o
+@itemx --only-matching
+@opindex -o
+@opindex --only-matching
+@cindex only matching
+Print only the matched (non-empty) parts of matching lines,
+with each such part on a separate output line.
+Output lines use the same delimiters as input, and delimiters are null
+bytes if @option{-z} (@option{--null-data}) is also used (@pxref{Other
+Options}).
+
+@item -q
+@itemx --quiet
+@itemx --silent
+@opindex -q
+@opindex --quiet
+@opindex --silent
+@cindex quiet, silent
+Quiet; do not write anything to standard output.
+Exit immediately with zero status if any match is found,
+even if an error was detected.
+Also see the @option{-s} or @option{--no-messages} option.
+(@option{-q} is specified by POSIX.)
+
+@item -s
+@itemx --no-messages
+@opindex -s
+@opindex --no-messages
+@cindex suppress error messages
+Suppress error messages about nonexistent or unreadable files.
+Portability note:
+unlike GNU @command{grep},
+7th Edition Unix @command{grep} did not conform to POSIX,
+because it lacked @option{-q}
+and its @option{-s} option behaved like
+GNU @command{grep}'s @option{-q} option.@footnote{Of course, 7th Edition
+Unix predated POSIX by several years!}
+USG-style @command{grep} also lacked @option{-q}
+but its @option{-s} option behaved like GNU @command{grep}'s.
+Portable shell scripts should avoid both
+@option{-q} and @option{-s} and should redirect
+standard and error output to @file{/dev/null} instead.
+(@option{-s} is specified by POSIX.)
+
+@end table
+
+@node Output Line Prefix Control
+@subsection Output Line Prefix Control
+
+When several prefix fields are to be output,
+the order is always file name, line number, and byte offset,
+regardless of the order in which these options were specified.
+
+@table @option
+
+@item -b
+@itemx --byte-offset
+@opindex -b
+@opindex --byte-offset
+@cindex byte offset
+Print the 0-based byte offset within the input file
+before each line of output.
+If @option{-o} (@option{--only-matching}) is specified,
+print the offset of the matching part itself.
+
+@item -H
+@itemx --with-filename
+@opindex -H
+@opindex --with-filename
+@cindex with filename prefix
+Print the file name for each match.
+This is the default when there is more than one file to search.
+
+@item -h
+@itemx --no-filename
+@opindex -h
+@opindex --no-filename
+@cindex no filename prefix
+Suppress the prefixing of file names on output.
+This is the default when there is only one file
+(or only standard input) to search.
+
+@item --label=@var{LABEL}
+@opindex --label
+@cindex changing name of standard input
+Display input actually coming from standard input
+as input coming from file @var{LABEL}.
+This can be useful for commands that transform a file's contents
+before searching; e.g.:
+
+@example
+gzip -cd foo.gz | grep --label=foo -H 'some pattern'
+@end example
+
+@item -n
+@itemx --line-number
+@opindex -n
+@opindex --line-number
+@cindex line numbering
+Prefix each line of output with the 1-based line number within its input file.
+(@option{-n} is specified by POSIX.)
+
+@item -T
+@itemx --initial-tab
+@opindex -T
+@opindex --initial-tab
+@cindex tab-aligned content lines
+Make sure that the first character of actual line content lies on a tab stop,
+so that the alignment of tabs looks normal.
+This is useful with options that prefix their output to the actual content:
+@option{-H}, @option{-n}, and @option{-b}.
+This may also prepend spaces to output line numbers and byte offsets
+so that lines from a single file all start at the same column.
+
+@item -Z
+@itemx --null
+@opindex -Z
+@opindex --null
+@cindex zero-terminated file names
+Output a zero byte (the ASCII NUL character)
+instead of the character that normally follows a file name.
+For example,
+@samp{grep -lZ} outputs a zero byte after each file name
+instead of the usual newline.
+This option makes the output unambiguous,
+even in the presence of file names containing unusual characters like newlines.
+This option can be used with commands like
+@samp{find -print0}, @samp{perl -0}, @samp{sort -z}, and @samp{xargs -0}
+to process arbitrary file names,
+even those that contain newline characters.
+
+@end table
+
+@node Context Line Control
+@subsection Context Line Control
+
+@cindex context lines
+@dfn{Context lines} are non-matching lines that are near a matching line.
+They are output only if one of the following options are used.
+Regardless of how these options are set,
+@command{grep} never outputs any given line more than once.
+If the @option{-o} (@option{--only-matching}) option is specified,
+these options have no effect and a warning is given upon their use.
+
+@table @option
+
+@item -A @var{num}
+@itemx --after-context=@var{num}
+@opindex -A
+@opindex --after-context
+@cindex after context
+@cindex context lines, after match
+Print @var{num} lines of trailing context after matching lines.
+
+@item -B @var{num}
+@itemx --before-context=@var{num}
+@opindex -B
+@opindex --before-context
+@cindex before context
+@cindex context lines, before match
+Print @var{num} lines of leading context before matching lines.
+
+@item -C @var{num}
+@itemx -@var{num}
+@itemx --context=@var{num}
+@opindex -C
+@opindex --context
+@opindex -@var{num}
+@cindex context lines
+Print @var{num} lines of leading and trailing output context.
+
+@item --group-separator=@var{string}
+@opindex --group-separator
+@cindex group separator
+When @option{-A}, @option{-B} or @option{-C} are in use,
+print @var{string} instead of @option{--} between groups of lines.
+
+@item --no-group-separator
+@opindex --group-separator
+@cindex group separator
+When @option{-A}, @option{-B} or @option{-C} are in use,
+do not print a separator between groups of lines.
+
+@end table
+
+Here are some points about how @command{grep} chooses
+the separator to print between prefix fields and line content:
+
+@itemize @bullet
+@item
+Matching lines normally use @samp{:} as a separator
+between prefix fields and actual line content.
+
+@item
+Context (i.e., non-matching) lines use @samp{-} instead.
+
+@item
+When context is not specified,
+matching lines are simply output one right after another.
+
+@item
+When context is specified,
+lines that are adjacent in the input form a group
+and are output one right after another, while
+by default a separator appears between non-adjacent groups.
+
+@item
+The default separator
+is a @samp{--} line; its presence and appearance
+can be changed with the options above.
+
+@item
+Each group may contain
+several matching lines when they are close enough to each other
+that two adjacent groups connect and can merge into a single
+contiguous one.
+@end itemize
+
+@node File and Directory Selection
+@subsection File and Directory Selection
+
+@table @option
+
+@item -a
+@itemx --text
+@opindex -a
+@opindex --text
+@cindex suppress binary data
+@cindex binary files
+Process a binary file as if it were text;
+this is equivalent to the @samp{--binary-files=text} option.
+
+@item --binary-files=@var{type}
+@opindex --binary-files
+@cindex binary files
+If a file's data or metadata
+indicate that the file contains binary data,
+assume that the file is of type @var{type}.
+Non-text bytes indicate binary data; these are either output bytes that are
+improperly encoded for the current locale (@pxref{Environment
+Variables}), or null input bytes when the
+@option{-z} (@option{--null-data}) option is not given (@pxref{Other
+Options}).
+
+By default, @var{type} is @samp{binary}, and @command{grep}
+suppresses output after null input binary data is discovered,
+and suppresses output lines that contain improperly encoded data.
+When some output is suppressed, @command{grep} follows any output
+with a one-line message saying that a binary file matches.
+
+If @var{type} is @samp{without-match},
+when @command{grep} discovers null input binary data
+it assumes that the rest of the file does not match;
+this is equivalent to the @option{-I} option.
+
+If @var{type} is @samp{text},
+@command{grep} processes binary data as if it were text;
+this is equivalent to the @option{-a} option.
+
+When @var{type} is @samp{binary}, @command{grep} may treat non-text
+bytes as line terminators even without the @option{-z}
+(@option{--null-data}) option.  This means choosing @samp{binary}
+versus @samp{text} can affect whether a pattern matches a file.  For
+example, when @var{type} is @samp{binary} the pattern @samp{q$} might
+match @samp{q} immediately followed by a null byte, even though this
+is not matched when @var{type} is @samp{text}.  Conversely, when
+@var{type} is @samp{binary} the pattern @samp{.} (period) might not
+match a null byte.
+
+@emph{Warning:} The @option{-a} (@option{--binary-files=text}) option
+might output binary garbage, which can have nasty side effects if the
+output is a terminal and if the terminal driver interprets some of it
+as commands.  On the other hand, when reading files whose text
+encodings are unknown, it can be helpful to use @option{-a} or to set
+@samp{LC_ALL='C'} in the environment, in order to find more matches
+even if the matches are unsafe for direct display.
+
+@item -D @var{action}
+@itemx --devices=@var{action}
+@opindex -D
+@opindex --devices
+@cindex device search
+If an input file is a device, FIFO, or socket, use @var{action} to process it.
+If @var{action} is @samp{read},
+all devices are read just as if they were ordinary files.
+If @var{action} is @samp{skip},
+devices, FIFOs, and sockets are silently skipped.
+By default, devices are read if they are on the command line or if the
+@option{-R} (@option{--dereference-recursive}) option is used, and are
+skipped if they are encountered recursively and the @option{-r}
+(@option{--recursive}) option is used.
+This option has no effect on a file that is read via standard input.
+
+@item -d @var{action}
+@itemx --directories=@var{action}
+@opindex -d
+@opindex --directories
+@cindex directory search
+@cindex symbolic links
+If an input file is a directory, use @var{action} to process it.
+By default, @var{action} is @samp{read},
+which means that directories are read just as if they were ordinary files
+(some operating systems and file systems disallow this,
+and will cause @command{grep}
+to print error messages for every directory or silently skip them).
+If @var{action} is @samp{skip}, directories are silently skipped.
+If @var{action} is @samp{recurse},
+@command{grep} reads all files under each directory, recursively,
+following command-line symbolic links and skipping other symlinks;
+this is equivalent to the @option{-r} option.
+
+@item --exclude=@var{glob}
+@opindex --exclude
+@cindex exclude files
+@cindex searching directory trees
+Skip any command-line file with a name suffix that matches the pattern
+@var{glob}, using wildcard matching; a name suffix is either the whole
+name, or a trailing part that starts with a non-slash character
+immediately after a slash (@samp{/}) in the name.
+When searching recursively, skip any subfile whose base
+name matches @var{glob}; the base name is the part after the last
+slash.  A pattern can use
+@samp{*}, @samp{?}, and @samp{[}...@samp{]} as wildcards,
+and @code{\} to quote a wildcard or backslash character literally.
+
+@item --exclude-from=@var{file}
+@opindex --exclude-from
+@cindex exclude files
+@cindex searching directory trees
+Skip files whose name matches any of the patterns
+read from @var{file} (using wildcard matching as described
+under @option{--exclude}).
+
+@item --exclude-dir=@var{glob}
+@opindex --exclude-dir
+@cindex exclude directories
+Skip any command-line directory with a name suffix that matches the
+pattern @var{glob}.  When searching recursively, skip any subdirectory
+whose base name matches @var{glob}.  Ignore any redundant trailing
+slashes in @var{glob}.
+
+@item -I
+Process a binary file as if it did not contain matching data;
+this is equivalent to the @samp{--binary-files=without-match} option.
+
+@item --include=@var{glob}
+@opindex --include
+@cindex include files
+@cindex searching directory trees
+Search only files whose name matches @var{glob},
+using wildcard matching as described under @option{--exclude}.
+If contradictory @option{--include} and @option{--exclude} options are
+given, the last matching one wins.  If no @option{--include} or
+@option{--exclude} options match, a file is included unless the first
+such option is @option{--include}.
+
+@item -r
+@itemx --recursive
+@opindex -r
+@opindex --recursive
+@cindex recursive search
+@cindex searching directory trees
+@cindex symbolic links
+For each directory operand,
+read and process all files in that directory, recursively.
+Follow symbolic links on the command line, but skip symlinks
+that are encountered recursively.
+Note that if no file operand is given, grep searches the working directory.
+This is the same as the @samp{--directories=recurse} option.
+
+@item -R
+@itemx --dereference-recursive
+@opindex -R
+@opindex --dereference-recursive
+@cindex recursive search
+@cindex searching directory trees
+@cindex symbolic links
+For each directory operand, read and process all files in that
+directory, recursively, following all symbolic links.
+
+@end table
+
+@node Other Options
+@subsection Other Options
+
+@table @option
+
+@item --
+@opindex --
+@cindex option delimiter
+Delimit the option list.  Later arguments, if any, are treated as
+operands even if they begin with @samp{-}.  For example, @samp{grep PAT --
+-file1 file2} searches for the pattern PAT in the files named @file{-file1}
+and @file{file2}.
+
+@item --line-buffered
+@opindex --line-buffered
+@cindex line buffering
+Use line buffering for standard output, regardless of output device.
+By default, standard output is line buffered for interactive devices,
+and is fully buffered otherwise.  With full buffering, the output
+buffer is flushed when full; with line buffering, the buffer is also
+flushed after every output line.  The buffer size is system dependent.
+
+@item -U
+@itemx --binary
+@opindex -U
+@opindex --binary
+@cindex MS-Windows binary I/O
+@cindex binary I/O
+On platforms that distinguish between text and binary I/O,
+use the latter when reading and writing files other
+than the user's terminal, so that all input bytes are read and written
+as-is.  This overrides the default behavior where @command{grep}
+follows the operating system's advice whether to use text or binary
+I/O@.  On MS-Windows when @command{grep} uses text I/O it reads a
+carriage return--newline pair as a newline and a Control-Z as
+end-of-file, and it writes a newline as a carriage return--newline
+pair.
+
+When using text I/O @option{--byte-offset} (@option{-b}) counts and
+@option{--binary-files} heuristics apply to input data after text-I/O
+processing.  Also, the @option{--binary-files} heuristics need not agree
+with the @option{--binary} option; that is, they may treat the data as
+text even if @option{--binary} is given, or vice versa.
+@xref{File and Directory Selection}.
+
+This option has no effect on GNU and other POSIX-compatible platforms,
+which do not distinguish text from binary I/O.
+
+@item -z
+@itemx --null-data
+@opindex -z
+@opindex --null-data
+@cindex zero-terminated lines
+Treat input and output data as sequences of lines, each terminated by
+a zero byte (the ASCII NUL character) instead of a newline.
+Like the @option{-Z} or @option{--null} option,
+this option can be used with commands like
+@samp{sort -z} to process arbitrary file names.
+
+@end table
+
+@node Environment Variables
+@section Environment Variables
+
+The behavior of @command{grep} is affected
+by the following environment variables.
+
+@vindex LANGUAGE @r{environment variable}
+@vindex LC_ALL @r{environment variable}
+@vindex LC_MESSAGES @r{environment variable}
+@vindex LANG @r{environment variable}
+The locale for category @w{@code{LC_@var{foo}}}
+is specified by examining the three environment variables
+@env{LC_ALL}, @w{@env{LC_@var{foo}}}, and @env{LANG},
+in that order.
+The first of these variables that is set specifies the locale.
+For example, if @env{LC_ALL} is not set,
+but @env{LC_COLLATE} is set to @samp{pt_BR},
+then the Brazilian Portuguese locale is used
+for the @env{LC_COLLATE} category.
+As a special case for @env{LC_MESSAGES} only, the environment variable
+@env{LANGUAGE} can contain a colon-separated list of languages that
+overrides the three environment variables that ordinarily specify
+the @env{LC_MESSAGES} category.
+The @samp{C} locale is used if none of these environment variables are set,
+if the locale catalog is not installed,
+or if @command{grep} was not compiled
+with national language support (NLS).
+The shell command @code{locale -a} lists locales that are currently available.
+
+Many of the environment variables in the following list let you
+control highlighting using
+Select Graphic Rendition (SGR)
+commands interpreted by the terminal or terminal emulator.
+(See the
+section
+in the documentation of your text terminal
+for permitted values and their meanings as character attributes.)
+These substring values are integers in decimal representation
+and can be concatenated with semicolons.
+@command{grep} takes care of assembling the result
+into a complete SGR sequence (@samp{\33[}...@samp{m}).
+Common values to concatenate include
+@samp{1} for bold,
+@samp{4} for underline,
+@samp{5} for blink,
+@samp{7} for inverse,
+@samp{39} for default foreground color,
+@samp{30} to @samp{37} for foreground colors,
+@samp{90} to @samp{97} for 16-color mode foreground colors,
+@samp{38;5;0} to @samp{38;5;255}
+for 88-color and 256-color modes foreground colors,
+@samp{49} for default background color,
+@samp{40} to @samp{47} for background colors,
+@samp{100} to @samp{107} for 16-color mode background colors,
+and @samp{48;5;0} to @samp{48;5;255}
+for 88-color and 256-color modes background colors.
+
+The two-letter names used in the @env{GREP_COLORS} environment variable
+(and some of the others) refer to terminal ``capabilities,'' the ability
+of a terminal to highlight text, or change its color, and so on.
+These capabilities are stored in an online database and accessed by
+the @code{terminfo} library.
+
+@cindex environment variables
+
+@table @env
+
+@item GREP_COLOR
+@vindex GREP_COLOR @r{environment variable}
+@cindex highlight markers
+This variable specifies the color used to highlight matched (non-empty) text.
+It is deprecated in favor of @env{GREP_COLORS}, but still supported.
+The @samp{mt}, @samp{ms}, and @samp{mc} capabilities of @env{GREP_COLORS}
+have priority over it.
+It can only specify the color used to highlight
+the matching non-empty text in any matching line
+(a selected line when the @option{-v} command-line option is omitted,
+or a context line when @option{-v} is specified).
+The default is @samp{01;31},
+which means a bold red foreground text on the terminal's default background.
+
+@item GREP_COLORS
+@vindex GREP_COLORS @r{environment variable}
+@cindex highlight markers
+This variable specifies the colors and other attributes
+used to highlight various parts of the output.
+Its value is a colon-separated list of @code{terminfo} capabilities
+that defaults to @samp{ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36}
+with the @samp{rv} and @samp{ne} boolean capabilities omitted (i.e., false).
+Supported capabilities are as follows.
+
+@table @code
+@item sl=
+@vindex sl GREP_COLORS @r{capability}
+SGR substring for whole selected lines
+(i.e.,
+matching lines when the @option{-v} command-line option is omitted,
+or non-matching lines when @option{-v} is specified).
+If however the boolean @samp{rv} capability
+and the @option{-v} command-line option are both specified,
+it applies to context matching lines instead.
+The default is empty (i.e., the terminal's default color pair).
+
+@item cx=
+@vindex cx GREP_COLORS @r{capability}
+SGR substring for whole context lines
+(i.e.,
+non-matching lines when the @option{-v} command-line option is omitted,
+or matching lines when @option{-v} is specified).
+If however the boolean @samp{rv} capability
+and the @option{-v} command-line option are both specified,
+it applies to selected non-matching lines instead.
+The default is empty (i.e., the terminal's default color pair).
+
+@item rv
+@vindex rv GREP_COLORS @r{capability}
+Boolean value that reverses (swaps) the meanings of
+the @samp{sl=} and @samp{cx=} capabilities
+when the @option{-v} command-line option is specified.
+The default is false (i.e., the capability is omitted).
+
+@item mt=01;31
+@vindex mt GREP_COLORS @r{capability}
+SGR substring for matching non-empty text in any matching line
+(i.e.,
+a selected line when the @option{-v} command-line option is omitted,
+or a context line when @option{-v} is specified).
+Setting this is equivalent to setting both @samp{ms=} and @samp{mc=}
+at once to the same value.
+The default is a bold red text foreground over the current line background.
+
+@item ms=01;31
+@vindex ms GREP_COLORS @r{capability}
+SGR substring for matching non-empty text in a selected line.
+(This is used only when the @option{-v} command-line option is omitted.)
+The effect of the @samp{sl=} (or @samp{cx=} if @samp{rv}) capability
+remains active when this takes effect.
+The default is a bold red text foreground over the current line background.
+
+@item mc=01;31
+@vindex mc GREP_COLORS @r{capability}
+SGR substring for matching non-empty text in a context line.
+(This is used only when the @option{-v} command-line option is specified.)
+The effect of the @samp{cx=} (or @samp{sl=} if @samp{rv}) capability
+remains active when this takes effect.
+The default is a bold red text foreground over the current line background.
+
+@item fn=35
+@vindex fn GREP_COLORS @r{capability}
+SGR substring for file names prefixing any content line.
+The default is a magenta text foreground over the terminal's default background.
+
+@item ln=32
+@vindex ln GREP_COLORS @r{capability}
+SGR substring for line numbers prefixing any content line.
+The default is a green text foreground over the terminal's default background.
+
+@item bn=32
+@vindex bn GREP_COLORS @r{capability}
+SGR substring for byte offsets prefixing any content line.
+The default is a green text foreground over the terminal's default background.
+
+@item se=36
+@vindex fn GREP_COLORS @r{capability}
+SGR substring for separators that are inserted
+between selected line fields (@samp{:}),
+between context line fields (@samp{-}),
+and between groups of adjacent lines
+when nonzero context is specified (@samp{--}).
+The default is a cyan text foreground over the terminal's default background.
+
+@item ne
+@vindex ne GREP_COLORS @r{capability}
+Boolean value that prevents clearing to the end of line
+using Erase in Line (EL) to Right (@samp{\33[K})
+each time a colorized item ends.
+This is needed on terminals on which EL is not supported.
+It is otherwise useful on terminals
+for which the @code{back_color_erase}
+(@code{bce}) boolean @code{terminfo} capability does not apply,
+when the chosen highlight colors do not affect the background,
+or when EL is too slow or causes too much flicker.
+The default is false (i.e., the capability is omitted).
+@end table
+
+Note that boolean capabilities have no @samp{=}... part.
+They are omitted (i.e., false) by default and become true when specified.
+
+
+@item LC_ALL
+@itemx LC_COLLATE
+@itemx LANG
+@vindex LC_ALL @r{environment variable}
+@vindex LC_COLLATE @r{environment variable}
+@vindex LANG @r{environment variable}
+@cindex character type
+@cindex national language support
+@cindex NLS
+These variables specify the locale for the @env{LC_COLLATE} category,
+which might affect how range expressions like @samp{[a-z]} are
+interpreted.
+
+@item LC_ALL
+@itemx LC_CTYPE
+@itemx LANG
+@vindex LC_ALL @r{environment variable}
+@vindex LC_CTYPE @r{environment variable}
+@vindex LANG @r{environment variable}
+@cindex encoding error
+@cindex null character
+These variables specify the locale for the @env{LC_CTYPE} category,
+which determines the type of characters,
+e.g., which characters are whitespace.
+This category also determines the character encoding.
+@xref{Character Encoding}.
+
+@item LANGUAGE
+@itemx LC_ALL
+@itemx LC_MESSAGES
+@itemx LANG
+@vindex LANGUAGE @r{environment variable}
+@vindex LC_ALL @r{environment variable}
+@vindex LC_MESSAGES @r{environment variable}
+@vindex LANG @r{environment variable}
+@cindex language of messages
+@cindex message language
+@cindex national language support
+@cindex translation of message language
+These variables specify the locale for the @env{LC_MESSAGES} category,
+which determines the language that @command{grep} uses for messages.
+The default @samp{C} locale uses American English messages.
+
+@item POSIXLY_CORRECT
+@vindex POSIXLY_CORRECT @r{environment variable}
+If set, @command{grep} behaves as POSIX requires; otherwise,
+@command{grep} behaves more like other GNU programs.
+POSIX
+requires that options that
+follow file names must be treated as file names;
+by default,
+such options are permuted to the front of the operand list
+and are treated as options.
+Also, @env{POSIXLY_CORRECT} disables special handling of an
+invalid bracket expression.  @xref{invalid-bracket-expr}.
+
+@item _@var{N}_GNU_nonoption_argv_flags_
+@vindex _@var{N}_GNU_nonoption_argv_flags_ @r{environment variable}
+(Here @code{@var{N}} is @command{grep}'s numeric process ID.)
+If the @var{i}th character of this environment variable's value is @samp{1},
+do not consider the @var{i}th operand of @command{grep} to be an option,
+even if it appears to be one.
+A shell can put this variable in the environment for each command it runs,
+specifying which operands are the results of file name wildcard expansion
+and therefore should not be treated as options.
+This behavior is available only with the GNU C library,
+and only when @env{POSIXLY_CORRECT} is not set.
+
+@end table
+
+The @env{GREP_OPTIONS} environment variable of @command{grep} 2.20 and
+earlier is no longer supported, as it caused problems when writing
+portable scripts.  To make arbitrary changes to how @command{grep}
+works, you can use an alias or script instead.  For example, if
+@command{grep} is in the directory @samp{/usr/bin} you can prepend
+@file{$HOME/bin} to your @env{PATH} and create an executable script
+@file{$HOME/bin/grep} containing the following:
+
+@example
+#! /bin/sh
+export PATH=/usr/bin
+exec grep --color=auto --devices=skip "$@@"
+@end example
+
+
+@node Exit Status
+@section Exit Status
+@cindex exit status
+@cindex return status
+
+Normally the exit status is 0 if a line is selected, 1 if no lines
+were selected, and 2 if an error occurred.  However, if the
+@option{-q} or @option{--quiet} or @option{--silent} option is used
+and a line is selected, the exit status is 0 even if an error
+occurred.  Other @command{grep} implementations may exit with status
+greater than 2 on error.
+
+@node grep Programs
+@section @command{grep} Programs
+@cindex @command{grep} programs
+@cindex variants of @command{grep}
+
+@command{grep} searches the named input files
+for lines containing a match to the given patterns.
+By default, @command{grep} prints the matching lines.
+A file named @file{-} stands for standard input.
+If no input is specified, @command{grep} searches the working
+directory @file{.} if given a command-line option specifying
+recursion; otherwise, @command{grep} searches standard input.
+There are four major variants of @command{grep},
+controlled by the following options.
+
+@table @option
+
+@item -G
+@itemx --basic-regexp
+@opindex -G
+@opindex --basic-regexp
+@cindex matching basic regular expressions
+Interpret patterns as basic regular expressions (BREs).
+This is the default.
+
+@item -E
+@itemx --extended-regexp
+@opindex -E
+@opindex --extended-regexp
+@cindex matching extended regular expressions
+Interpret patterns as extended regular expressions (EREs).
+(@option{-E} is specified by POSIX.)
+
+@item -F
+@itemx --fixed-strings
+@opindex -F
+@opindex --fixed-strings
+@cindex matching fixed strings
+Interpret patterns as fixed strings, not regular expressions.
+(@option{-F} is specified by POSIX.)
+
+@item -P
+@itemx --perl-regexp
+@opindex -P
+@opindex --perl-regexp
+@cindex matching Perl-compatible regular expressions
+Interpret patterns as Perl-compatible regular expressions (PCREs).
+PCRE support is here to stay, but consider this option experimental when
+combined with the @option{-z} (@option{--null-data}) option, and note that
+@samp{grep@ -P} may warn of unimplemented features.
+@xref{Other Options}.
+
+@end table
+
+In addition,
+two variant programs @command{egrep} and @command{fgrep} are available.
+@command{egrep} is the same as @samp{grep@ -E}.
+@command{fgrep} is the same as @samp{grep@ -F}.
+Direct invocation as either
+@command{egrep} or @command{fgrep} is deprecated,
+but is provided to allow historical applications
+that rely on them to run unmodified.
+
+
+@node Regular Expressions
+@chapter Regular Expressions
+@cindex regular expressions
+
+A @dfn{regular expression} is a pattern that describes a set of strings.
+Regular expressions are constructed analogously to arithmetic expressions,
+by using various operators to combine smaller expressions.
+@command{grep} understands
+three different versions of regular expression syntax:
+basic (BRE), extended (ERE), and Perl-compatible (PCRE).
+In GNU @command{grep},
+there is no difference in available functionality between the basic and
+extended syntaxes.
+In other implementations, basic regular expressions are less powerful.
+The following description applies to extended regular expressions;
+differences for basic regular expressions are summarized afterwards.
+Perl-compatible regular expressions give additional functionality, and
+are documented in the @i{pcresyntax}(3) and @i{pcrepattern}(3) manual
+pages, but work only if PCRE is available in the system.
+
+@menu
+* Fundamental Structure::
+* Character Classes and Bracket Expressions::
+* The Backslash Character and Special Expressions::
+* Anchoring::
+* Back-references and Subexpressions::
+* Basic vs Extended::
+* Character Encoding::
+* Matching Non-ASCII::
+@end menu
+
+@node Fundamental Structure
+@section Fundamental Structure
+
+@cindex ordinary characters
+@cindex special characters
+In regular expressions, the characters @samp{.?*+@{|()[\^$} are
+@dfn{special characters} and have uses described below.  All other
+characters are @dfn{ordinary characters}, and each ordinary character
+is a regular expression that matches itself.
+
+@opindex .
+@cindex dot
+@cindex period
+The period @samp{.} matches any single character.
+It is unspecified whether @samp{.} matches an encoding error.
+
+@cindex interval expressions
+A regular expression may be followed by one of several
+repetition operators; the operators beginning with @samp{@{}
+are called @dfn{interval expressions}.
+
+@table @samp
+
+@item ?
+@opindex ?
+@cindex question mark
+@cindex match expression at most once
+The preceding item is optional and is matched at most once.
+
+@item *
+@opindex *
+@cindex asterisk
+@cindex match expression zero or more times
+The preceding item is matched zero or more times.
+
+@item +
+@opindex +
+@cindex plus sign
+@cindex match expression one or more times
+The preceding item is matched one or more times.
+
+@item @{@var{n}@}
+@opindex @{@var{n}@}
+@cindex braces, one argument
+@cindex match expression @var{n} times
+The preceding item is matched exactly @var{n} times.
+
+@item @{@var{n},@}
+@opindex @{@var{n},@}
+@cindex braces, second argument omitted
+@cindex match expression @var{n} or more times
+The preceding item is matched @var{n} or more times.
+
+@item @{,@var{m}@}
+@opindex @{,@var{m}@}
+@cindex braces, first argument omitted
+@cindex match expression at most @var{m} times
+The preceding item is matched at most @var{m} times.
+This is a GNU extension.
+
+@item @{@var{n},@var{m}@}
+@opindex @{@var{n},@var{m}@}
+@cindex braces, two arguments
+@cindex match expression from @var{n} to @var{m} times
+The preceding item is matched at least @var{n} times, but not more than
+@var{m} times.
+
+@end table
+
+The empty regular expression matches the empty string.
+Two regular expressions may be concatenated;
+the resulting regular expression
+matches any string formed by concatenating two substrings
+that respectively match the concatenated expressions.
+
+Two regular expressions may be joined by the infix operator @samp{|};
+the resulting regular expression
+matches any string matching either alternate expression.
+
+Repetition takes precedence over concatenation,
+which in turn takes precedence over alternation.
+A whole expression may be enclosed in parentheses
+to override these precedence rules and form a subexpression.
+An unmatched @samp{)} matches just itself.
+
+@node Character Classes and Bracket Expressions
+@section Character Classes and Bracket Expressions
+
+@cindex bracket expression
+@cindex character class
+A @dfn{bracket expression} is a list of characters enclosed by @samp{[} and
+@samp{]}.
+It matches any single character in that list.
+If the first character of the list is the caret @samp{^},
+then it matches any character @strong{not} in the list,
+and it is unspecified whether it matches an encoding error.
+For example, the regular expression
+@samp{[0123456789]} matches any single digit,
+whereas @samp{[^()]} matches any single character that is not
+an opening or closing parenthesis, and might or might not match an
+encoding error.
+
+@cindex range expression
+Within a bracket expression, a @dfn{range expression} consists of two
+characters separated by a hyphen.
+It matches any single character that
+sorts between the two characters, inclusive.
+In the default C locale, the sorting sequence is the native character
+order; for example, @samp{[a-d]} is equivalent to @samp{[abcd]}.
+In other locales, the sorting sequence is not specified, and
+@samp{[a-d]} might be equivalent to @samp{[abcd]} or to
+@samp{[aBbCcDd]}, or it might fail to match any character, or the set of
+characters that it matches might even be erratic.
+To obtain the traditional interpretation
+of bracket expressions, you can use the @samp{C} locale by setting the
+@env{LC_ALL} environment variable to the value @samp{C}.
+
+Finally, certain named classes of characters are predefined within
+bracket expressions, as follows.
+Their interpretation depends on the @env{LC_CTYPE} locale;
+for example, @samp{[[:alnum:]]} means the character class of numbers and letters
+in the current locale.
+
+@cindex classes of characters
+@cindex character classes
+@table @samp
+
+@item [:alnum:]
+@opindex alnum @r{character class}
+@cindex alphanumeric characters
+Alphanumeric characters:
+@samp{[:alpha:]} and @samp{[:digit:]}; in the @samp{C} locale and ASCII
+character encoding, this is the same as @samp{[0-9A-Za-z]}.
+
+@item [:alpha:]
+@opindex alpha @r{character class}
+@cindex alphabetic characters
+Alphabetic characters:
+@samp{[:lower:]} and @samp{[:upper:]}; in the @samp{C} locale and ASCII
+character encoding, this is the same as @samp{[A-Za-z]}.
+
+@item [:blank:]
+@opindex blank @r{character class}
+@cindex blank characters
+Blank characters:
+space and tab.
+
+@item [:cntrl:]
+@opindex cntrl @r{character class}
+@cindex control characters
+Control characters.
+In ASCII, these characters have octal codes 000
+through 037, and 177 (DEL).
+In other character sets, these are
+the equivalent characters, if any.
+
+@item [:digit:]
+@opindex digit @r{character class}
+@cindex digit characters
+@cindex numeric characters
+Digits: @code{0 1 2 3 4 5 6 7 8 9}.
+
+@item [:graph:]
+@opindex graph @r{character class}
+@cindex graphic characters
+Graphical characters:
+@samp{[:alnum:]} and @samp{[:punct:]}.
+
+@item [:lower:]
+@opindex lower @r{character class}
+@cindex lower-case letters
+Lower-case letters; in the @samp{C} locale and ASCII character
+encoding, this is
+@code{a b c d e f g h i j k l m n o p q r s t u v w x y z}.
+
+@item [:print:]
+@opindex print @r{character class}
+@cindex printable characters
+Printable characters:
+@samp{[:alnum:]}, @samp{[:punct:]}, and space.
+
+@item [:punct:]
+@opindex punct @r{character class}
+@cindex punctuation characters
+Punctuation characters; in the @samp{C} locale and ASCII character
+encoding, this is
+@code{!@: " # $ % & ' ( ) * + , - .@: / : ; < = > ?@: @@ [ \ ] ^ _ ` @{ | @} ~}.
+
+@item [:space:]
+@opindex space @r{character class}
+@cindex space characters
+@cindex whitespace characters
+Space characters: in the @samp{C} locale, this is
+tab, newline, vertical tab, form feed, carriage return, and space.
+@xref{Usage}, for more discussion of matching newlines.
+
+@item [:upper:]
+@opindex upper @r{character class}
+@cindex upper-case letters
+Upper-case letters: in the @samp{C} locale and ASCII character
+encoding, this is
+@code{A B C D E F G H I J K L M N O P Q R S T U V W X Y Z}.
+
+@item [:xdigit:]
+@opindex xdigit @r{character class}
+@cindex xdigit class
+@cindex hexadecimal digits
+Hexadecimal digits:
+@code{0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f}.
+
+@end table
+Note that the brackets in these class names are
+part of the symbolic names, and must be included in addition to
+the brackets delimiting the bracket expression.
+
+@anchor{invalid-bracket-expr}
+If you mistakenly omit the outer brackets, and search for say, @samp{[:upper:]},
+GNU @command{grep} prints a diagnostic and exits with status 2, on
+the assumption that you did not intend to search for the nominally
+equivalent regular expression: @samp{[:epru]}.
+Set the @env{POSIXLY_CORRECT} environment variable to disable this feature.
+
+Special characters lose their special meaning inside bracket expressions.
+
+@table @samp
+@item ]
+ends the bracket expression if it's not the first list item.
+So, if you want to make the @samp{]} character a list item,
+you must put it first.
+
+@item [.
+represents the open collating symbol.
+
+@item .]
+represents the close collating symbol.
+
+@item [=
+represents the open equivalence class.
+
+@item =]
+represents the close equivalence class.
+
+@item [:
+represents the open character class symbol, and should be followed by a
+valid character class name.
+
+@item :]
+represents the close character class symbol.
+
+@item -
+represents the range if it's not first or last in a list or the ending point
+of a range.
+
+@item ^
+represents the characters not in the list.
+If you want to make the @samp{^}
+character a list item, place it anywhere but first.
+
+@end table
+
+@node The Backslash Character and Special Expressions
+@section The Backslash Character and Special Expressions
+@cindex backslash
+
+The @samp{\} character followed by a special character is a regular
+expression that matches the special character.
+The @samp{\} character,
+when followed by certain ordinary characters,
+takes a special meaning:
+
+@table @samp
+
+@item \b
+Match the empty string at the edge of a word.
+
+@item \B
+Match the empty string provided it's not at the edge of a word.
+
+@item \<
+Match the empty string at the beginning of a word.
+
+@item \>
+Match the empty string at the end of a word.
+
+@item \w
+Match word constituent, it is a synonym for @samp{[_[:alnum:]]}.
+
+@item \W
+Match non-word constituent, it is a synonym for @samp{[^_[:alnum:]]}.
+
+@item \s
+Match whitespace, it is a synonym for @samp{[[:space:]]}.
+
+@item \S
+Match non-whitespace, it is a synonym for @samp{[^[:space:]]}.
+
+@end table
+
+For example, @samp{\brat\b} matches the separate word @samp{rat},
+@samp{\Brat\B} matches @samp{crate} but not @samp{furry rat}.
+
+@node Anchoring
+@section Anchoring
+@cindex anchoring
+
+The caret @samp{^} and the dollar sign @samp{$} are special characters that
+respectively match the empty string at the beginning and end of a line.
+They are termed @dfn{anchors}, since they force the match to be ``anchored''
+to beginning or end of a line, respectively.
+
+@node Back-references and Subexpressions
+@section Back-references and Subexpressions
+@cindex subexpression
+@cindex back-reference
+
+The back-reference @samp{\@var{n}},
+where @var{n} is a single nonzero digit, matches
+the substring previously matched by the @var{n}th parenthesized subexpression
+of the regular expression.
+For example, @samp{(a)\1} matches @samp{aa}.
+If the parenthesized subexpression does not participate in the match,
+the back-reference makes the whole match fail;
+for example, @samp{(a)*\1} fails to match @samp{a}.
+If the parenthesized subexpression matches more than one substring,
+the back-reference refers to the last matched substring;
+for example, @samp{^(ab*)*\1$} matches @samp{ababbabb} but not @samp{ababbab}.
+When multiple regular expressions are given with
+@option{-e} or from a file (@samp{-f @var{file}}),
+back-references are local to each expression.
+
+@xref{Known Bugs}, for some known problems with back-references.
+
+@node Basic vs Extended
+@section Basic vs Extended Regular Expressions
+@cindex basic regular expressions
+
+In basic regular expressions the characters @samp{?}, @samp{+},
+@samp{@{}, @samp{|}, @samp{(}, and @samp{)} lose their special meaning;
+instead use the backslashed versions @samp{\?}, @samp{\+}, @samp{\@{},
+@samp{\|}, @samp{\(}, and @samp{\)}.  Also, a backslash is needed
+before an interval expression's closing @samp{@}}, and an unmatched
+@code{\)} is invalid.
+
+Portable scripts should avoid the following constructs, as
+POSIX says they produce undefined results:
+
+@itemize @bullet
+@item
+Extended regular expressions that use back-references.
+@item
+Basic regular expressions that use @samp{\?}, @samp{\+}, or @samp{\|}.
+@item
+Empty parenthesized regular expressions like @samp{()}.
+@item
+Empty alternatives (as in, e.g, @samp{a|}).
+@item
+Repetition operators that immediately follow empty expressions,
+unescaped @samp{$}, or other repetition operators.
+@item
+A backslash escaping an ordinary character (e.g., @samp{\S}),
+unless it is a back-reference.
+@item
+An unescaped @samp{[} that is not part of a bracket expression.
+@item
+In extended regular expressions, an unescaped @samp{@{} that is not
+part of an interval expression.
+@end itemize
+
+@cindex interval expressions
+Traditional @command{egrep} did not support interval expressions and
+some @command{egrep} implementations use @samp{\@{} and @samp{\@}} instead, so
+portable scripts should avoid interval expressions in @samp{grep@ -E} patterns
+and should use @samp{[@{]} to match a literal @samp{@{}.
+
+GNU @command{grep@ -E} attempts to support traditional usage by
+assuming that @samp{@{} is not special if it would be the start of an
+invalid interval expression.
+For example, the command
+@samp{grep@ -E@ '@{1'} searches for the two-character string @samp{@{1}
+instead of reporting a syntax error in the regular expression.
+POSIX allows this behavior as an extension, but portable scripts
+should avoid it.
+
+@node Character Encoding
+@section Character Encoding
+@cindex character encoding
+
+The @env{LC_CTYPE} locale specifies the encoding of characters in
+patterns and data, that is, whether text is encoded in UTF-8, ASCII,
+or some other encoding.  @xref{Environment Variables}.
+
+In the @samp{C} or @samp{POSIX} locale, every character is encoded as
+a single byte and every byte is a valid character.  In more-complex
+encodings such as UTF-8, a sequence of multiple bytes may be needed to
+represent a character, and some bytes may be encoding errors that do
+not contribute to the representation of any character.  POSIX does not
+specify the behavior of @command{grep} when patterns or input data
+contain encoding errors or null characters, so portable scripts should
+avoid such usage.  As an extension to POSIX, GNU @command{grep} treats
+null characters like any other character.  However, unless the
+@option{-a} (@option{--binary-files=text}) option is used, the
+presence of null characters in input or of encoding errors in output
+causes GNU @command{grep} to treat the file as binary and suppress
+details about matches.  @xref{File and Directory Selection}.
+
+Regardless of locale, the 103 characters in the POSIX Portable
+Character Set (a subset of ASCII) are always encoded as a single byte,
+and the 128 ASCII characters have their usual single-byte encodings on
+all but oddball platforms.
+
+@node Matching Non-ASCII
+@section Matching Non-ASCII and Non-printable Characters
+@cindex non-ASCII matching
+@cindex non-printable matching
+
+In a regular expression, non-ASCII and non-printable characters other
+than newline are not special, and represent themselves.  For example,
+in a locale using UTF-8 the command @samp{grep 'Λ@tie{}ω'} (where the
+white space between @samp{Λ} and the @samp{ω} is a tab character)
+searches for @samp{Λ} (Unicode character U+039B GREEK CAPITAL LETTER
+LAMBDA), followed by a tab (U+0009 TAB), followed by @samp{ω} (U+03C9
+GREEK SMALL LETTER OMEGA).
+
+Suppose you want to limit your pattern to only printable characters
+(or even only printable ASCII characters) to keep your script readable
+or portable, but you also want to match specific non-ASCII or non-null
+non-printable characters.  If you are using the @option{-P}
+(@option{--perl-regexp}) option, PCREs give you several ways to do
+this.  Otherwise, if you are using Bash, the GNU project's shell, you
+can represent these characters via ANSI-C quoting.  For example, the
+Bash commands @samp{grep $'Λ\tω'} and @samp{grep $'\u039B\t\u03C9'}
+both search for the same three-character string @samp{Λ@tie{}ω}
+mentioned earlier.  However, because Bash translates ANSI-C quoting
+before @command{grep} sees the pattern, this technique should not be
+used to match printable ASCII characters; for example, @samp{grep
+$'\u005E'} is equivalent to @samp{grep '^'} and matches any line, not
+just lines containing the character @samp{^} (U+005E CIRCUMFLEX
+ACCENT).
+
+Since PCREs and ANSI-C quoting are GNU extensions to POSIX, portable
+shell scripts written in ASCII should use other methods to match
+specific non-ASCII characters.  For example, in a UTF-8 locale the
+command @samp{grep "$(printf '\316\233\t\317\211\n')"} is a portable
+albeit hard-to-read alternative to Bash's @samp{grep $'Λ\tω'}.
+However, none of these techniques will let you put a null character
+directly into a command-line pattern; null characters can appear only
+in a pattern specified via the @option{-f} (@option{--file}) option.
+
+@node Usage
+@chapter Usage
+
+@cindex usage, examples
+Here is an example command that invokes GNU @command{grep}:
+
+@example
+grep -i 'hello.*world' menu.h main.c
+@end example
+
+@noindent
+This lists all lines in the files @file{menu.h} and @file{main.c} that
+contain the string @samp{hello} followed by the string @samp{world};
+this is because @samp{.*} matches zero or more characters within a line.
+@xref{Regular Expressions}.
+The @option{-i} option causes @command{grep}
+to ignore case, causing it to match the line @samp{Hello, world!}, which
+it would not otherwise match.
+
+Here is a more complex example,
+showing the location and contents of any line
+containing @samp{f} and ending in @samp{.c},
+within all files in the current directory whose names
+start with non-@samp{.}, contain @samp{g}, and end in @samp{.h}.
+The @option{-n} option outputs line numbers, the @option{--} argument
+treats any later arguments as file names not options even if
+@code{*g*.h} expands to a file name that starts with @samp{-},
+and the empty file @file{/dev/null} causes file names to be output
+even if only one file name happens to be of the form @samp{*g*.h}.
+
+@example
+grep -n -- 'f.*\.c$' *g*.h /dev/null
+@end example
+
+@noindent
+Note that the regular expression syntax used in the pattern differs
+from the globbing syntax that the shell uses to match file names.
+
+@xref{Invoking}, for more details about
+how to invoke @command{grep}.
+
+@cindex using @command{grep}, Q&A
+@cindex FAQ about @command{grep} usage
+Here are some common questions and answers about @command{grep} usage.
+
+@enumerate
+
+@item
+How can I list just the names of matching files?
+
+@example
+grep -l 'main' test-*.c
+@end example
+
+@noindent
+lists names of @samp{test-*.c} files in the current directory whose contents
+mention @samp{main}.
+
+@item
+How do I search directories recursively?
+
+@example
+grep -r 'hello' /home/gigi
+@end example
+
+@noindent
+searches for @samp{hello} in all files
+under the @file{/home/gigi} directory.
+For more control over which files are searched,
+use @command{find} and @command{grep}.
+For example, the following command searches only C files:
+
+@example
+find /home/gigi -name '*.c' ! -type d \
+  -exec grep -H 'hello' '@{@}' +
+@end example
+
+This differs from the command:
+
+@example
+grep -H 'hello' /home/gigi/*.c
+@end example
+
+which merely looks for @samp{hello} in non-hidden C files in
+@file{/home/gigi} whose names end in @samp{.c}.
+The @command{find} command line above is more similar to the command:
+
+@example
+grep -r --include='*.c' 'hello' /home/gigi
+@end example
+
+@item
+What if a pattern or file has a leading @samp{-}?
+
+@example
+grep -- '--cut here--' *
+@end example
+
+@noindent
+searches for all lines matching @samp{--cut here--}.
+Without @option{--},
+@command{grep} would attempt to parse @samp{--cut here--} as a list of
+options, and there would be similar problems with any file names
+beginning with @samp{-}.
+
+Alternatively, you can prevent misinterpretation of leading @samp{-}
+by using @option{-e} for patterns and leading @samp{./} for files:
+
+@example
+grep -e '--cut here--' ./*
+@end example
+
+@item
+Suppose I want to search for a whole word, not a part of a word?
+
+@example
+grep -w 'hello' test*.log
+@end example
+
+@noindent
+searches only for instances of @samp{hello} that are entire words;
+it does not match @samp{Othello}.
+For more control, use @samp{\<} and
+@samp{\>} to match the start and end of words.
+For example:
+
+@example
+grep 'hello\>' test*.log
+@end example
+
+@noindent
+searches only for words ending in @samp{hello}, so it matches the word
+@samp{Othello}.
+
+@item
+How do I output context around the matching lines?
+
+@example
+grep -C 2 'hello' test*.log
+@end example
+
+@noindent
+prints two lines of context around each matching line.
+
+@item
+How do I force @command{grep} to print the name of the file?
+
+Append @file{/dev/null}:
+
+@example
+grep 'eli' /etc/passwd /dev/null
+@end example
+
+gets you:
+
+@example
+/etc/passwd:eli:x:2098:1000:Eli Smith:/home/eli:/bin/bash
+@end example
+
+Alternatively, use @option{-H}, which is a GNU extension:
+
+@example
+grep -H 'eli' /etc/passwd
+@end example
+
+@item
+Why do people use strange regular expressions on @command{ps} output?
+
+@example
+ps -ef | grep '[c]ron'
+@end example
+
+If the pattern had been written without the square brackets, it would
+have matched not only the @command{ps} output line for @command{cron},
+but also the @command{ps} output line for @command{grep}.
+Note that on some platforms,
+@command{ps} limits the output to the width of the screen;
+@command{grep} does not have any limit on the length of a line
+except the available memory.
+
+@item
+Why does @command{grep} report ``Binary file matches''?
+
+If @command{grep} listed all matching ``lines'' from a binary file, it
+would probably generate output that is not useful, and it might even
+muck up your display.
+So GNU @command{grep} suppresses output from
+files that appear to be binary files.
+To force GNU @command{grep}
+to output lines even from files that appear to be binary, use the
+@option{-a} or @samp{--binary-files=text} option.
+To eliminate the
+``Binary file matches'' messages, use the @option{-I} or
+@samp{--binary-files=without-match} option,
+or the @option{-s} or @option{--no-messages} option.
+
+@item
+Why doesn't @samp{grep -lv} print non-matching file names?
+
+@samp{grep -lv} lists the names of all files containing one or more
+lines that do not match.
+To list the names of all files that contain no
+matching lines, use the @option{-L} or @option{--files-without-match}
+option.
+
+@item
+I can do ``OR'' with @samp{|}, but what about ``AND''?
+
+@example
+grep 'paul' /etc/motd | grep 'franc,ois'
+@end example
+
+@noindent
+finds all lines that contain both @samp{paul} and @samp{franc,ois}.
+
+@item
+Why does the empty pattern match every input line?
+
+The @command{grep} command searches for lines that contain strings
+that match a pattern.  Every line contains the empty string, so an
+empty pattern causes @command{grep} to find a match on each line.  It
+is not the only such pattern: @samp{^}, @samp{$}, and many
+other patterns cause @command{grep} to match every line.
+
+To match empty lines, use the pattern @samp{^$}.  To match blank
+lines, use the pattern @samp{^[[:blank:]]*$}.  To match no lines at
+all, use the command @samp{grep -f /dev/null}.
+
+@item
+How can I search in both standard input and in files?
+
+Use the special file name @samp{-}:
+
+@example
+cat /etc/passwd | grep 'alain' - /etc/motd
+@end example
+
+@item
+Why is this back-reference failing?
+
+@example
+echo 'ba' | grep -E '(a)\1|b\1'
+@end example
+
+This outputs an error message, because the second @samp{\1}
+has nothing to refer back to, meaning it will never match anything.
+
+@item
+How can I match across lines?
+
+Standard grep cannot do this, as it is fundamentally line-based.
+Therefore, merely using the @code{[:space:]} character class does not
+match newlines in the way you might expect.
+
+With the GNU @command{grep} option @option{-z} (@option{--null-data}), each
+input and output ``line'' is null-terminated; @pxref{Other Options}.  Thus,
+you can match newlines in the input, but typically if there is a match
+the entire input is output, so this usage is often combined with
+output-suppressing options like @option{-q}, e.g.:
+
+@example
+printf 'foo\nbar\n' | grep -z -q 'foo[[:space:]]\+bar'
+@end example
+
+If this does not suffice, you can transform the input
+before giving it to @command{grep}, or turn to @command{awk},
+@command{sed}, @command{perl}, or many other utilities that are
+designed to operate across lines.
+
+@item
+What do @command{grep}, @command{fgrep}, and @command{egrep} stand for?
+
+The name @command{grep} comes from the way line editing was done on Unix.
+For example,
+@command{ed} uses the following syntax
+to print a list of matching lines on the screen:
+
+@example
+global/regular expression/print
+g/re/p
+@end example
+
+@command{fgrep} stands for Fixed @command{grep};
+@command{egrep} stands for Extended @command{grep}.
+
+@end enumerate
+
+
+@node Performance
+@chapter Performance
+
+@cindex performance
+Typically @command{grep} is an efficient way to search text.  However,
+it can be quite slow in some cases, and it can search large files
+where even minor performance tweaking can help significantly.
+Although the algorithm used by @command{grep} is an implementation
+detail that can change from release to release, understanding its
+basic strengths and weaknesses can help you improve its performance.
+
+The @command{grep} command operates partly via a set of automata that
+are designed for efficiency, and partly via a slower matcher that
+takes over when the fast matchers run into unusual features like
+back-references.  When feasible, the Boyer--Moore fast string
+searching algorithm is used to match a single fixed pattern, and the
+Aho--Corasick algorithm is used to match multiple fixed patterns.
+
+@cindex locales
+Generally speaking @command{grep} operates more efficiently in
+single-byte locales, since it can avoid the special processing needed
+for multi-byte characters.  If your patterns will work just as well
+that way, setting @env{LC_ALL} to a single-byte locale can help
+performance considerably.  Setting @samp{LC_ALL='C'} can be
+particularly efficient, as @command{grep} is tuned for that locale.
+
+@cindex case insensitive search
+Outside the @samp{C} locale, case-insensitive search, and search for
+bracket expressions like @samp{[a-z]} and @samp{[[=a=]b]}, can be
+surprisingly inefficient due to difficulties in fast portable access to
+concepts like multi-character collating elements.
+
+@cindex back-references
+A back-reference such as @samp{\1} can hurt performance significantly
+in some cases, since back-references cannot in general be implemented
+via a finite state automaton, and instead trigger a backtracking
+algorithm that can be quite inefficient.  For example, although the
+pattern @samp{^(.*)\1@{14@}(.*)\2@{13@}$} matches only lines whose
+lengths can be written as a sum @math{15x + 14y} for nonnegative
+integers @math{x} and @math{y}, the pattern matcher does not perform
+linear Diophantine analysis and instead backtracks through all
+possible matching strings, using an algorithm that is exponential in
+the worst case.
+
+@cindex holes in files
+On some operating systems that support files with holes---large
+regions of zeros that are not physically present on secondary
+storage---@command{grep} can skip over the holes efficiently without
+needing to read the zeros.  This optimization is not available if the
+@option{-a} (@option{--binary-files=text}) option is used (@pxref{File and
+Directory Selection}), unless the @option{-z} (@option{--null-data})
+option is also used (@pxref{Other Options}).
+
+For more about the algorithms used by @command{grep} and about
+related string matching algorithms, see:
+
+@frenchspacing on
+@itemize @bullet
+@item
+Aho AV. Algorithms for finding patterns in strings.
+In: van Leeuwen J. @emph{Handbook of Theoretical Computer Science}, vol. A.
+New York: Elsevier; 1990. p. 255--300.
+This surveys classic string matching algorithms, some of which are
+used by @command{grep}.
+
+@item
+Aho AV, Corasick MJ. Efficient string matching: an aid to bibliographic search.
+@emph{CACM}. 1975;18(6):333--40.
+@url{https://dx.doi.org/10.1145/360825.360855}.
+This introduces the Aho--Corasick algorithm.
+
+@item
+Boyer RS, Moore JS. A fast string searching algorithm.
+@emph{CACM}. 1977;20(10):762--72.
+@url{https://dx.doi.org/10.1145/359842.359859}.
+This introduces the Boyer--Moore algorithm.
+
+@item
+Faro S, Lecroq T. The exact online string matching problem: a review
+of the most recent results.
+@emph{ACM Comput Surv}. 2013;45(2):13.
+@url{https://dx.doi.org/10.1145/2431211.2431212}.
+This surveys string matching algorithms that might help improve the
+performance of @command{grep} in the future.
+@end itemize
+@frenchspacing off
+
+@node Reporting Bugs
+@chapter Reporting bugs
+
+@cindex bugs, reporting
+Bug reports can be found at the
+@url{https://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep,
+GNU bug report logs for @command{grep}}.
+If you find a bug not listed there, please email it to
+@email{bug-grep@@gnu.org} to create a new bug report.
+
+@menu
+* Known Bugs::
+@end menu
+
+@node Known Bugs
+@section Known Bugs
+@cindex Bugs, known
+
+Large repetition counts in the @samp{@{n,m@}} construct may cause
+@command{grep} to use lots of memory.
+In addition, certain other
+obscure regular expressions require exponential time and
+space, and may cause @command{grep} to run out of memory.
+
+Back-references can greatly slow down matching, as they can generate
+exponentially many matching possibilities that can consume both time
+and memory to explore.  Also, the POSIX specification for
+back-references is at times unclear.  Furthermore, many regular
+expression implementations have back-reference bugs that can cause
+programs to return incorrect answers or even crash, and fixing these
+bugs has often been low-priority: for example, as of 2021 the
+@url{https://sourceware.org/bugzilla/,GNU C library bug database}
+contained back-reference bugs
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=52,,52},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=10844,,10844},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=11053,,11053},
+@url{https://sourceware.org/bugzilla/show_bug.cgi?id=24269,,24269}
+and @url{https://sourceware.org/bugzilla/show_bug.cgi?id=25322,,25322},
+with little sign of forthcoming fixes.  Luckily,
+back-references are rarely useful and it should be little trouble to
+avoid them in practical applications.
+
+
+@node Copying
+@chapter Copying
+@cindex copying
+
+GNU @command{grep} is licensed under the GNU GPL, which makes it @dfn{free
+software}.
+
+The ``free'' in ``free software'' refers to liberty, not price.  As
+some GNU project advocates like to point out, think of ``free speech''
+rather than ``free beer''.  In short, you have the right (freedom) to
+run and change @command{grep} and distribute it to other people, and---if you
+want---charge money for doing either.  The important restriction is
+that you have to grant your recipients the same rights and impose the
+same restrictions.
+
+This general method of licensing software is sometimes called
+@dfn{open source}.  The GNU project prefers the term ``free software''
+for reasons outlined at
+@url{https://www.gnu.org/philosophy/open-source-misses-the-point.html}.
+
+This manual is free documentation in the same sense.  The
+documentation license is included below.  The license for the program
+is available with the source code, or at
+@url{https://www.gnu.org/licenses/gpl.html}.
+
+@menu
+* GNU Free Documentation License::
+@end menu
+
+@node GNU Free Documentation License
+@section GNU Free Documentation License
+
+@include fdl.texi
+
+
+@node Index
+@unnumbered Index
+
+@printindex cp
+
+@bye
diff --git a/src/grep/doc/stamp-vti b/src/grep/doc/stamp-vti
new file mode 100644
index 0000000..0bb9e6b
--- /dev/null
+++ b/src/grep/doc/stamp-vti
@@ -0,0 +1,4 @@
+@set UPDATED 8 August 2021
+@set UPDATED-MONTH August 2021
+@set EDITION 3.7
+@set VERSION 3.7
diff --git a/src/grep/doc/version.texi b/src/grep/doc/version.texi
new file mode 100644
index 0000000..0bb9e6b
--- /dev/null
+++ b/src/grep/doc/version.texi
@@ -0,0 +1,4 @@
+@set UPDATED 8 August 2021
+@set UPDATED-MONTH August 2021
+@set EDITION 3.7
+@set VERSION 3.7