Merging upstream version 1.5.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

30 files changed, 328 insertions, 279 deletions

diff --git a/ChangeLog b/ChangeLog
index 16cbbf3..8ae4053 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2016-05-15  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.5 released.
+	* zupdate.cc (zupdate_file): Pass '-q' to zcmp if verbosity < 0.
+	* zcat.cc zgrep.cc ztest.cc (main): Don't use stdin more than once.
+	* zdiff.cc (set_fifonames): Use '_' if both names are different.
+	* configure: Avoid warning on some shells when testing for g++.
+	* Makefile.in: Detect the existence of install-info.
+	* testsuite/check.sh: A POSIX shell is required to run the tests.
+
 2015-05-29  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.4 released.
@@ -105,7 +115,7 @@
 
 	* Version 0.3 released.
 	* Removed default compressor.
-	* zcat.in, zgrep.in: Do not read data from stdin.
+	* zcat.in, zgrep.in: Don't read data from stdin.
 	* Updated home page and mailing list addresses.
 
 2009-08-13  Antonio Diaz Diaz  <ant_diaz@teleline.es>
@@ -118,7 +128,7 @@
 	* Version 0.1 released.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is a collection of facts, and thus it is not copyrightable,
 but just in case, you have unlimited permission to copy, distribute and
diff --git a/INSTALL b/INSTALL
index 1da6042..ae495e7 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,7 +1,7 @@
 Requirements
 ------------
 You will need a C++ compiler.
-I use gcc 4.9.1 and 4.1.2, but the code should compile with any
+I use gcc 5.3.0 and 4.1.2, but the code should compile with any
 standards compliant compiler.
 Gcc is available at http://gcc.gnu.org.
 
@@ -70,7 +70,7 @@ After running 'configure', you can run 'make' and 'make install' as
 explained above.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute and modify it.
diff --git a/Makefile.in b/Makefile.in
index 0b7a4d0..f21f0b6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -6,6 +6,7 @@ INSTALL_SCRIPT = $(INSTALL) -m 755
 INSTALL_DATA = $(INSTALL) -m 644
 INSTALL_DIR = $(INSTALL) -d -m 755
 SHELL = /bin/sh
+CAN_RUN_INSTALLINFO = $(SHELL) -c "install-info --version" > /dev/null 2>&1
 
 objs = arg_parser.o rc.o zutils.o \
        zcat.o zcmp.o zdiff.o zgrep.o ztest.o zupdate.o
@@ -109,7 +110,7 @@ $(VPATH)/doc/ztest.1 : ztest
 	  -o $@ --no-info ./ztest
 
 $(VPATH)/doc/zupdate.1 : zupdate
-	help2man -n 'recompress bzip2, gzip, xz files to lzip files' \
+	help2man -n 'recompress bzip2, gzip, xz files to lzip format' \
 	  -o $@ --no-info ./zupdate
 
 Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
@@ -145,7 +146,9 @@ install-info :
 	if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 	$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
-	-install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
 
 install-info-compress : install-info
 	lzip -v -9 "$(DESTDIR)$(infodir)/$(pkgname).info"
@@ -187,7 +190,9 @@ uninstall-bin :
 	-rm -f "$(DESTDIR)$(sysconfdir)/$(pkgname)rc"
 
 uninstall-info :
-	-install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 
 uninstall-man :
diff --git a/NEWS b/NEWS
index 43de972..dbdef2a 100644
--- a/NEWS
+++ b/NEWS
@@ -1,14 +1,9 @@
-Changes in version 1.4:
+Changes in version 1.5:
 
-The option "--format" has been renamed to "-O, --force-format".
+zupdate now passes '-q' to zcmp if specified.
 
-Option "-M, --format=<list>" now restricts automatic search to the
-formats listed in the comma-separated <list>. This change introduces a
-backward incompatibility with previous versions of zutils.
+zcat, zgrep and ztest no longer read from standard input more than once
+if '-' is specified multiple times.
 
-If the pattern begins with "-", zgrep now prepends "-e" before passing
-it to grep. ('zgrep -- -pattern file' now works as expected).
-
-The targets "install-compress", "install-strip-compress",
-"install-info-compress" and "install-man-compress" have been added to
-the Makefile.
+zdiff now uses '_' as separator if both temporary file names are
+otherwise different. For example 'xxx_file.lz' and 'xxx_file.gz'.
diff --git a/README b/README
index 57c8389..1493410 100644
--- a/README
+++ b/README
@@ -12,7 +12,8 @@ those utilities supporting it.
 
 The provided utilities are zcat, zcmp, zdiff, zgrep, ztest and zupdate.
 The supported formats are bzip2, gzip, lzip and xz.
-The compressor to be used for each format is configurable at runtime.
+Zutils uses external compressors. The compressor to be used for each
+format is configurable at runtime.
 
 zcat, zcmp, zdiff, and zgrep are improved replacements for the shell
 scripts provided by GNU gzip. ztest is unique to zutils. zupdate is
@@ -36,7 +37,7 @@ have been compressed. Decompressed is used to refer to data which has
 undergone the process of decompression.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute and modify it.
diff --git a/arg_parser.cc b/arg_parser.cc
index 551264a..82972ad 100644
--- a/arg_parser.cc
+++ b/arg_parser.cc
@@ -1,5 +1,5 @@
 /*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
-    Copyright (C) 2006-2015 Antonio Diaz Diaz.
+    Copyright (C) 2006-2016 Antonio Diaz Diaz.
 
     This library is free software. Redistribution and use in source and
     binary forms, with or without modification, are permitted provided
diff --git a/arg_parser.h b/arg_parser.h
index 3dc85d0..f45b9ac 100644
--- a/arg_parser.h
+++ b/arg_parser.h
@@ -1,5 +1,5 @@
 /*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
-    Copyright (C) 2006-2015 Antonio Diaz Diaz.
+    Copyright (C) 2006-2016 Antonio Diaz Diaz.
 
     This library is free software. Redistribution and use in source and
     binary forms, with or without modification, are permitted provided
diff --git a/configure b/configure
index a3c78c4..ddb3140 100755
--- a/configure
+++ b/configure
@@ -1,12 +1,12 @@
 #! /bin/sh
 # configure script for Zutils - Utilities dealing with compressed files
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
 #
 # This configure script is free software: you have unlimited permission
 # to copy, distribute and modify it.
 
 pkgname=zutils
-pkgversion=1.4
+pkgversion=1.5
 srctrigger=doc/${pkgname}.texi
 
 # clear some things potentially inherited from environment.
@@ -28,8 +28,8 @@ DIFF=diff
 GREP=grep
 
 # checking whether we are using GNU C++.
-${CXX} --version > /dev/null 2>&1
-if [ $? != 0 ] ; then
+if /bin/sh -c "${CXX} --version" > /dev/null 2>&1 ; then true
+else
 	CXX=c++
 	CXXFLAGS='-W -O2'
 fi
@@ -148,7 +148,7 @@ if [ -z "${no_create}" ] ; then
 	rm -f config.status
 	cat > config.status << EOF
 #! /bin/sh
-# This file was generated automatically by configure. Do not edit.
+# This file was generated automatically by configure. Don't edit.
 # Run this file to recreate the current configuration.
 #
 # This script is free software: you have unlimited permission
@@ -177,8 +177,8 @@ echo "GREP = ${GREP}"
 rm -f Makefile
 cat > Makefile << EOF
 # Makefile for Zutils - Utilities dealing with compressed files
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
-# This file was generated automatically by configure. Do not edit.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
+# This file was generated automatically by configure. Don't edit.
 #
 # This Makefile is free software: you have unlimited permission
 # to copy, distribute and modify it.
diff --git a/doc/zcat.1 b/doc/zcat.1
index 5b3ba2e..b67aa40 100644
--- a/doc/zcat.1
+++ b/doc/zcat.1
@@ -1,19 +1,20 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZCAT "1" "May 2015" "zcat (zutils) 1.4" "User Commands"
+.TH ZCAT "1" "May 2016" "zcat (zutils) 1.5" "User Commands"
 .SH NAME
 zcat \- decompress and concatenate files to standard output
 .SH SYNOPSIS
 .B zcat
 [\fI\,options\/\fR] [\fI\,files\/\fR]
 .SH DESCRIPTION
-Zcat copies each given file ("\-" means standard input), to standard
-output. If any given file is compressed, its decompressed content is
-used. If a given file does not exist, and its name does not end with one
-of the known extensions, zcat tries the compressed file names
-corresponding to the supported formats. If no files are specified,
-data is read from standard input, decompressed if needed, and sent to
-standard output. Data read from standard input must be of the same type;
-all uncompressed or all in the same compression format.
+Zcat copies each given file to standard output. If any given file is
+compressed, its decompressed content is used. If a given file does not
+exist, and its name does not end with one of the known extensions, zcat
+tries the compressed file names corresponding to the supported formats.
+.PP
+If no files are specified, or if a file is specified as '\-', data is
+read from standard input, decompressed if needed, and sent to standard
+output. Data read from standard input must be of the same type; all
+uncompressed or all in the same compression format.
 .PP
 The supported formats are bzip2, gzip, lzip and xz.
 .PP
@@ -87,7 +88,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/zcmp.1 b/doc/zcmp.1
index d1a4ee4..33f725e 100644
--- a/doc/zcmp.1
+++ b/doc/zcmp.1
@@ -1,16 +1,16 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZCMP "1" "May 2015" "zcmp (zutils) 1.4" "User Commands"
+.TH ZCMP "1" "May 2016" "zcmp (zutils) 1.5" "User Commands"
 .SH NAME
 zcmp \- decompress and compare two files byte by byte
 .SH SYNOPSIS
 .B zcmp
 [\fI\,options\/\fR] \fI\,file1 \/\fR[\fI\,file2\/\fR]
 .SH DESCRIPTION
-Zcmp compares two files ("\-" means standard input), and if they
-differ, tells the first byte and line number where they differ. Bytes
-and lines are numbered starting with 1. If any given file is compressed,
-its decompressed content is used. Compressed files are decompressed on
-the fly; no temporary files are created.
+Zcmp compares two files ('\-' means standard input), and if they differ,
+tells the first byte and line number where they differ. Bytes and lines
+are numbered starting with 1. If any given file is compressed, its
+decompressed content is used. Compressed files are decompressed on the
+fly; no temporary files are created.
 .PP
 The supported formats are bzip2, gzip, lzip and xz.
 .PP
@@ -85,7 +85,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/zdiff.1 b/doc/zdiff.1
index 6a58cc3..3e1d607 100644
--- a/doc/zdiff.1
+++ b/doc/zdiff.1
@@ -1,12 +1,12 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZDIFF "1" "May 2015" "zdiff (zutils) 1.4" "User Commands"
+.TH ZDIFF "1" "May 2016" "zdiff (zutils) 1.5" "User Commands"
 .SH NAME
 zdiff \- decompress and compare two files line by line
 .SH SYNOPSIS
 .B zdiff
 [\fI\,options\/\fR] \fI\,file1 \/\fR[\fI\,file2\/\fR]
 .SH DESCRIPTION
-Zdiff compares two files ("\-" means standard input), and if they
+Zdiff compares two files ('\-' means standard input), and if they
 differ, shows the differences line by line. If any given file is
 compressed, its decompressed content is used. Zdiff is a front end to
 the diff program and has the limitation that messages from diff refer to
@@ -109,7 +109,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/zgrep.1 b/doc/zgrep.1
index 864a6a5..67d8277 100644
--- a/doc/zgrep.1
+++ b/doc/zgrep.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZGREP "1" "May 2015" "zgrep (zutils) 1.4" "User Commands"
+.TH ZGREP "1" "May 2016" "zgrep (zutils) 1.5" "User Commands"
 .SH NAME
 zgrep \- search compressed files for a regular expression
 .SH SYNOPSIS
@@ -11,10 +11,12 @@ on any combination of compressed and uncompressed files. If any given
 file is compressed, its decompressed content is used. If a given file
 does not exist, and its name does not end with one of the known
 extensions, zgrep tries the compressed file names corresponding to the
-supported formats. If no files are specified, data is read from
-standard input, decompressed if needed, and fed to grep. Data read from
-standard input must be of the same type; all uncompressed or all
-in the same compression format.
+supported formats.
+.PP
+If no files are specified, or if a file is specified as '\-', data is
+read from standard input, decompressed if needed, and fed to grep. Data
+read from standard input must be of the same type; all uncompressed or
+all in the same compression format.
 .PP
 The supported formats are bzip2, gzip, lzip and xz.
 .PP
@@ -133,7 +135,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/ztest.1 b/doc/ztest.1
index 793e94d..3311667 100644
--- a/doc/ztest.1
+++ b/doc/ztest.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZTEST "1" "May 2015" "ztest (zutils) 1.4" "User Commands"
+.TH ZTEST "1" "May 2016" "ztest (zutils) 1.5" "User Commands"
 .SH NAME
 ztest \- verify integrity of compressed files
 .SH SYNOPSIS
@@ -7,9 +7,10 @@ ztest \- verify integrity of compressed files
 [\fI\,options\/\fR] [\fI\,files\/\fR]
 .SH DESCRIPTION
 Ztest verifies the integrity of the specified compressed files.
-Uncompressed files are ignored. If no files are specified, the integrity
-of compressed data read from standard input is verified. Data read from
-standard input must be all in the same compression format.
+Uncompressed files are ignored. If no files are specified, or if a file
+is specified as '\-', the integrity of compressed data read from standard
+input is verified. Data read from standard input must be all in the same
+compression format.
 .PP
 The supported formats are bzip2, gzip, lzip and xz.
 .PP
@@ -61,7 +62,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/zupdate.1 b/doc/zupdate.1
index a14914c..059867e 100644
--- a/doc/zupdate.1
+++ b/doc/zupdate.1
@@ -1,7 +1,7 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH ZUPDATE "1" "May 2015" "zupdate (zutils) 1.4" "User Commands"
+.TH ZUPDATE "1" "May 2016" "zupdate (zutils) 1.5" "User Commands"
 .SH NAME
-zupdate \- recompress bzip2, gzip, xz files to lzip files
+zupdate \- recompress bzip2, gzip, xz files to lzip format
 .SH SYNOPSIS
 .B zupdate
 [\fI\,options\/\fR] [\fI\,files\/\fR]
@@ -34,7 +34,7 @@ display this help and exit
 output version information and exit
 .TP
 \fB\-f\fR, \fB\-\-force\fR
-do not skip a file even if the .lz exists
+don't skip a file even if the .lz exists
 .TP
 \fB\-k\fR, \fB\-\-keep\fR
 keep (don't delete) input files
@@ -76,7 +76,7 @@ Report bugs to zutils\-bug@nongnu.org
 .br
 Zutils home page: http://www.nongnu.org/zutils/zutils.html
 .SH COPYRIGHT
-Copyright \(co 2015 Antonio Diaz Diaz.
+Copyright \(co 2016 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/zutils.info b/doc/zutils.info
index 090ec48..b753ec0 100644
--- a/doc/zutils.info
+++ b/doc/zutils.info
@@ -12,7 +12,7 @@ File: zutils.info,  Node: Top,  Next: Introduction,  Up: (dir)
 Zutils Manual
 *************
 
-This manual is for Zutils (version 1.4, 29 May 2015).
+This manual is for Zutils (version 1.5, 15 May 2016).
 
 * Menu:
 
@@ -29,7 +29,7 @@ This manual is for Zutils (version 1.4, 29 May 2015).
 * Concept index::       Index of concepts
 
 
-   Copyright (C) 2009-2015 Antonio Diaz Diaz.
+   Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
    This manual is free documentation: you have unlimited permission to
 copy, distribute and modify it.
@@ -52,7 +52,8 @@ in those utilities supporting it.
 
 The provided utilities are zcat, zcmp, zdiff, zgrep, ztest and zupdate.
 The supported formats are bzip2, gzip, lzip and xz.
-The compressor to be used for each format is configurable at runtime.
+Zutils uses external compressors. The compressor to be used for each
+format is configurable at runtime.
 
    zcat, zcmp, zdiff, and zgrep are improved replacements for the shell
 scripts provided by GNU gzip. ztest is unique to zutils. zupdate is
@@ -140,7 +141,7 @@ described here.
 '--lz=COMMAND'
 '--xz=COMMAND'
      Set program (may include arguments) to be used as (de)compressor
-     for the given format. The mane of the program can't begin with
+     for the given format. The name of the program can't begin with
      '-'. These options override the values set in 'zutilsrc'. The
      compression program used must meet three requirements:
 
@@ -163,7 +164,7 @@ File: zutils.info,  Node: The zutilsrc file,  Next: Zcat,  Prev: Common options,
 
 'zutilsrc' is the runtime configuration file for zutils. In it you may
 define the compressor name and options to be used for each format.  The
-'zutilsrc' file is optional; you do not need to install it in order to
+'zutilsrc' file is optional; you don't need to install it in order to
 run zutils.
 
    The compressors specified in the command line override those
@@ -186,16 +187,15 @@ File: zutils.info,  Node: Zcat,  Next: Zcmp,  Prev: The zutilsrc file,  Up: Top
 4 Zcat
 ******
 
-zcat copies each given file ('-' means standard input), to standard
-output. If any given file is compressed, its decompressed content is
-used. If a given file does not exist, and its name does not end with one
-of the known extensions, zcat tries the compressed file names
-corresponding to the supported formats.
+zcat copies each given file to standard output. If any given file is
+compressed, its decompressed content is used. If a given file does not
+exist, and its name does not end with one of the known extensions, zcat
+tries the compressed file names corresponding to the supported formats.
 
-   If no files are specified, data is read from standard input,
-decompressed if needed, and sent to standard output. Data read from
-standard input must be of the same type; all uncompressed or all in the
-same compression format.
+   If no files are specified, or if a file is specified as '-', data is
+read from standard input, decompressed if needed, and sent to standard
+output. Data read from standard input must be of the same type; all
+uncompressed or all in the same compression format.
 
    The format for running zcat is:
 
@@ -336,7 +336,7 @@ differences were found, and 2 means trouble.
 '-s'
 '--quiet'
 '--silent'
-     Do not print anything; only return an exit status indicating
+     Don't print anything; only return an exit status indicating
      whether the files differ.
 
 
@@ -460,10 +460,10 @@ does not exist, and its name does not end with one of the known
 extensions, zgrep tries the compressed file names corresponding to the
 supported formats.
 
-   If no files are specified, data is read from standard input,
-decompressed if needed, and fed to grep. Data read from standard input
-must be of the same type; all uncompressed or all in the same
-compression format.
+   If no files are specified, or if a file is specified as '-', data is
+read from standard input, decompressed if needed, and fed to grep.
+Data read from standard input must be of the same type; all uncompressed
+or all in the same compression format.
 
    The format for running zgrep is:
 
@@ -509,6 +509,9 @@ matches were found, and 2 means trouble.
 '-f FILE'
 '--file=FILE'
      Obtain patterns from FILE, one per line.
+     When searching in several files at once, command substitution can
+     be used with '-e' to read FILE only once, for example if FILE is
+     not a regular file: 'zgrep -e "$(cat FILE)" file1.lz file2.gz'
 
 '-F'
 '--fixed-strings'
@@ -594,9 +597,10 @@ File: zutils.info,  Node: Ztest,  Next: Zupdate,  Prev: Zgrep,  Up: Top
 *******
 
 ztest verifies the integrity of the specified compressed files.
-Uncompressed files are ignored. If no files are specified, the integrity
-of compressed data read from standard input is verified. Data read from
-standard input must be all in the same compression format.
+Uncompressed files are ignored. If no files are specified, or if a file
+is specified as '-', the integrity of compressed data read from
+standard input is verified. Data read from standard input must be all in
+the same compression format.
 
    Note that some xz files lack integrity information, and therefore
 can't be verified as reliably as the other formats can.
@@ -642,7 +646,7 @@ File: zutils.info,  Node: Zupdate,  Next: Problems,  Prev: Ztest,  Up: Top
 *********
 
 zupdate recompresses files from bzip2, gzip, and xz formats to lzip
-format. The originals are compared with the new files and then deleted.
+format. Each original is compared with the new file and then deleted.
 Only regular files with standard file name extensions are recompressed,
 other files are ignored. Compressed files are decompressed and then
 recompressed on the fly; no temporary files are created. The lzip format
@@ -682,7 +686,7 @@ otherwise.
 
 '-f'
 '--force'
-     Do not skip a file for which a lzip compressed version already
+     Don't skip a file for which a lzip compressed version already
      exists.  '--force' compares the content of the input file with the
      content of the existing lzip file and deletes the input file if
      both contents are identical.
@@ -758,17 +762,17 @@ Concept index
 Tag Table:
 Node: Top222
 Node: Introduction1142
-Node: Common options3692
-Ref: compressor-requirements5450
-Node: The zutilsrc file5822
-Node: Zcat6748
-Node: Zcmp8795
-Node: Zdiff11255
-Node: Zgrep13895
-Node: Ztest16990
-Node: Zupdate18494
-Node: Problems21369
-Node: Concept index21903
+Node: Common options3726
+Ref: compressor-requirements5484
+Node: The zutilsrc file5856
+Node: Zcat6781
+Node: Zcmp8834
+Node: Zdiff11293
+Node: Zgrep13933
+Node: Ztest17271
+Node: Zupdate18809
+Node: Problems21681
+Node: Concept index22215
 
 End Tag Table
 
diff --git a/doc/zutils.texi b/doc/zutils.texi
index 236265c..34c15b4 100644
--- a/doc/zutils.texi
+++ b/doc/zutils.texi
@@ -6,8 +6,8 @@
 @finalout
 @c %**end of header
 
-@set UPDATED 29 May 2015
-@set VERSION 1.4
+@set UPDATED 15 May 2016
+@set VERSION 1.5
 
 @dircategory Data Compression
 @direntry
@@ -49,7 +49,7 @@ This manual is for Zutils (version @value{VERSION}, @value{UPDATED}).
 @end menu
 
 @sp 1
-Copyright @copyright{} 2009-2015 Antonio Diaz Diaz.
+Copyright @copyright{} 2009-2016 Antonio Diaz Diaz.
 
 This manual is free documentation: you have unlimited permission
 to copy, distribute and modify it.
@@ -72,7 +72,8 @@ in those utilities supporting it.
 @noindent
 The provided utilities are zcat, zcmp, zdiff, zgrep, ztest and zupdate.@*
 The supported formats are bzip2, gzip, lzip and xz.@*
-The compressor to be used for each format is configurable at runtime.
+Zutils uses external compressors. The compressor to be used for each
+format is configurable at runtime.
 
 zcat, zcmp, zdiff, and zgrep are improved replacements for the shell
 scripts provided by GNU gzip. ztest is unique to zutils. zupdate is
@@ -164,7 +165,7 @@ Don't read the runtime configuration file @samp{zutilsrc}.
 @itemx --lz=@var{command}
 @itemx --xz=@var{command}
 Set program (may include arguments) to be used as (de)compressor for the
-given format. The mane of the program can't begin with @samp{-}. These
+given format. The name of the program can't begin with @samp{-}. These
 options override the values set in @file{zutilsrc}. The compression
 program used must meet three requirements:
 
@@ -189,7 +190,7 @@ It must return 0 if no errors occurred, and a non-zero value otherwise.
 
 @file{zutilsrc} is the runtime configuration file for zutils. In it you
 may define the compressor name and options to be used for each format.
-The @file{zutilsrc} file is optional; you do not need to install it in
+The @file{zutilsrc} file is optional; you don't need to install it in
 order to run zutils.
 
 The compressors specified in the command line override those specified
@@ -217,16 +218,15 @@ where <format> is one of @samp{bz2}, @samp{gz}, @samp{lz} or @samp{xz}.
 @chapter Zcat
 @cindex zcat
 
-zcat copies each given file (@samp{-} means standard input), to standard
-output. If any given file is compressed, its decompressed content is
-used. If a given file does not exist, and its name does not end with one
-of the known extensions, zcat tries the compressed file names
-corresponding to the supported formats.
+zcat copies each given file to standard output. If any given file is
+compressed, its decompressed content is used. If a given file does not
+exist, and its name does not end with one of the known extensions, zcat
+tries the compressed file names corresponding to the supported formats.
 
-If no files are specified, data is read from standard input,
-decompressed if needed, and sent to standard output. Data read from
-standard input must be of the same type; all uncompressed or all in the
-same compression format.
+If no files are specified, or if a file is specified as @samp{-}, data
+is read from standard input, decompressed if needed, and sent to
+standard output. Data read from standard input must be of the same type;
+all uncompressed or all in the same compression format.
 
 The format for running zcat is:
 
@@ -378,7 +378,7 @@ without verifying its format, and the exact file names of both
 @itemx -s
 @itemx --quiet
 @itemx --silent
-Do not print anything; only return an exit status indicating whether the
+Don't print anything; only return an exit status indicating whether the
 files differ.
 
 @end table
@@ -510,10 +510,10 @@ does not exist, and its name does not end with one of the known
 extensions, zgrep tries the compressed file names corresponding to the
 supported formats.
 
-If no files are specified, data is read from standard input,
-decompressed if needed, and fed to grep. Data read from standard input
-must be of the same type; all uncompressed or all in the same
-compression format.
+If no files are specified, or if a file is specified as @samp{-}, data
+is read from standard input, decompressed if needed, and fed to grep.
+Data read from standard input must be of the same type; all uncompressed
+or all in the same compression format.
 
 The format for running zgrep is:
 
@@ -562,7 +562,11 @@ Treat @var{pattern} as an extended regular expression.
 
 @item -f @var{file}
 @itemx --file=@var{file}
-Obtain patterns from @var{file}, one per line.
+Obtain patterns from @var{file}, one per line.@*
+When searching in several files at once, command substitution can be
+used with @code{-e} to read @var{file} only once, for example if
+@var{file} is not a regular file:
+@w{@code{zgrep -e "$(cat @var{file})" file1.lz file2.gz}}
 
 @item -F
 @itemx --fixed-strings
@@ -648,9 +652,10 @@ Match only whole lines.
 @cindex ztest
 
 ztest verifies the integrity of the specified compressed files.
-Uncompressed files are ignored. If no files are specified, the integrity
-of compressed data read from standard input is verified. Data read from
-standard input must be all in the same compression format.
+Uncompressed files are ignored. If no files are specified, or if a file
+is specified as @samp{-}, the integrity of compressed data read from
+standard input is verified. Data read from standard input must be all in
+the same compression format.
 
 Note that some xz files lack integrity information, and therefore can't
 be verified as reliably as the other formats can.
@@ -700,7 +705,7 @@ Further -v's increase the verbosity level.
 @cindex zupdate
 
 zupdate recompresses files from bzip2, gzip, and xz formats to lzip
-format. The originals are compared with the new files and then deleted.
+format. Each original is compared with the new file and then deleted.
 Only regular files with standard file name extensions are recompressed,
 other files are ignored. Compressed files are decompressed and then
 recompressed on the fly; no temporary files are created. The lzip format
@@ -745,7 +750,7 @@ zupdate supports the following options:
 @table @code
 @item -f
 @itemx --force
-Do not skip a file for which a lzip compressed version already exists.
+Don't skip a file for which a lzip compressed version already exists.
 @samp{--force} compares the content of the input file with the content
 of the existing lzip file and deletes the input file if both contents
 are identical.
diff --git a/rc.cc b/rc.cc
index 1376655..2326465 100644
--- a/rc.cc
+++ b/rc.cc
@@ -1,5 +1,5 @@
 /*  Zutils - Utilities dealing with compressed files
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     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
@@ -37,7 +37,7 @@ int verbosity = 0;
 namespace {
 
 const char * const config_file_name = "zutilsrc";
-const char * const     program_year = "2015";
+const char * const     program_year = "2016";
 
 std::string compressor_names[num_formats] =
   { "bzip2", "gzip", "lzip", "xz" };		// default compressor names
@@ -173,7 +173,7 @@ bool parse_rc_line( const std::string & line,
   while( i < len && std::isspace( line[i] ) ) ++i;	// strip spaces
   if( i <= 0 || i >= len || line[i] != '=' )
     { if( verbosity >= 0 )
-        std::fprintf( stderr, "%s %d: missing '='.\n", filename, linenum );
+        std::fprintf( stderr, "%s %d: missing '='\n", filename, linenum );
       return false; }
   ++i;							// skip the '='
   if( !parse_compressor_command( line, i, format_index ) )
@@ -334,26 +334,23 @@ void show_version()
 
 void show_error( const char * const msg, const int errcode, const bool help )
   {
-  if( verbosity >= 0 )
+  if( verbosity < 0 ) return;
+  if( msg && msg[0] )
     {
-    if( msg && msg[0] )
-      {
-      std::fprintf( stderr, "%s: %s", program_name, msg );
-      if( errcode > 0 )
-        std::fprintf( stderr, ": %s.", std::strerror( errcode ) );
-      std::fprintf( stderr, "\n" );
-      }
-    if( help )
-      std::fprintf( stderr, "Try '%s --help' for more information.\n",
-                    invocation_name );
+    std::fprintf( stderr, "%s: %s", program_name, msg );
+    if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
+    std::fputc( '\n', stderr );
     }
+  if( help )
+    std::fprintf( stderr, "Try '%s --help' for more information.\n",
+                  invocation_name );
   }
 
 
 void show_error2( const char * const msg, const char * const name )
   {
   if( verbosity >= 0 )
-    std::fprintf( stderr, "%s: %s '%s': %s.\n",
+    std::fprintf( stderr, "%s: %s '%s': %s\n",
                   program_name, msg, name, std::strerror( errno ) );
   }
 
@@ -369,7 +366,7 @@ void internal_error( const char * const msg )
 void show_close_error( const char * const prog_name )
   {
   if( verbosity >= 0 )
-    std::fprintf( stderr, "%s: Can't close output of %s: %s.\n",
+    std::fprintf( stderr, "%s: Can't close output of %s: %s\n",
                   program_name, prog_name, std::strerror( errno ) );
   }
 
@@ -377,7 +374,7 @@ void show_close_error( const char * const prog_name )
 void show_exec_error( const char * const prog_name )
   {
   if( verbosity >= 0 )
-    std::fprintf( stderr, "%s: Can't exec '%s': %s.\n",
+    std::fprintf( stderr, "%s: Can't exec '%s': %s\n",
                   program_name, prog_name, std::strerror( errno ) );
   }
 
@@ -385,7 +382,7 @@ void show_exec_error( const char * const prog_name )
 void show_fork_error( const char * const prog_name )
   {
   if( verbosity >= 0 )
-    std::fprintf( stderr, "%s: Can't fork '%s': %s.\n",
+    std::fprintf( stderr, "%s: Can't fork '%s': %s\n",
                   program_name, prog_name, std::strerror( errno ) );
   }
 
@@ -399,7 +396,7 @@ int wait_for_child( const pid_t pid, const char * const name,
     if( errno != EINTR )
       {
       if( verbosity >= 0 )
-        std::fprintf( stderr, "%s: Error waiting termination of '%s': %s.\n",
+        std::fprintf( stderr, "%s: Error waiting termination of '%s': %s\n",
                       program_name, name, std::strerror( errno ) );
       _exit( eretval );
       }
diff --git a/rc.h b/rc.h
index 7135072..fa9175c 100644
--- a/rc.h
+++ b/rc.h
@@ -1,5 +1,5 @@
 /*  Zutils - Utilities dealing with compressed files
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     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
diff --git a/recursive.cc b/recursive.cc
index 9c98362..b08122d 100644
--- a/recursive.cc
+++ b/recursive.cc
@@ -1,5 +1,5 @@
 /*  Zutils - Utilities dealing with compressed files
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     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
diff --git a/testsuite/check.sh b/testsuite/check.sh
index cbd53b3..70b49d3 100755
--- a/testsuite/check.sh
+++ b/testsuite/check.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # check script for Zutils - Utilities dealing with compressed files
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
 #
 # This script is free software: you have unlimited permission
 # to copy, distribute and modify it.
@@ -27,9 +27,16 @@ if [ ! -f "${ZUPDATE}" ] || [ ! -x "${ZUPDATE}" ] ; then
 	exit 1
 fi
 
+if [ -e "${ZUPDATE}" ] 2> /dev/null ; then true
+else
+	echo "$0: a POSIX shell is required to run the tests"
+	echo "Try bash -c \"$0 $1 $2\""
+	exit 1
+fi
+
 if [ -d tmp ] ; then rm -rf tmp ; fi
 mkdir tmp
-cd "${objdir}"/tmp
+cd "${objdir}"/tmp || framework_failure
 
 for i in ${compressors}; do
 	cat "${testdir}"/test.txt > in || framework_failure
@@ -75,6 +82,9 @@ printf .
 "${ZCAT}" -N < in.lz > copy || fail=1
 cmp in copy || fail=1
 printf .
+"${ZCAT}" -N -O lz - - < in.lz > copy || fail=1
+cmp in copy || fail=1
+printf .
 "${ZCAT}" -N --lz='lzip -q' < in.lz > copy || fail=1
 cmp in copy || fail=1
 printf .
@@ -87,25 +97,23 @@ printf .
 "${ZCAT}" -N in in.gz in.bz2 in.lz -- -in- -in-.lz > copy || fail=1
 cmp in6 copy || fail=1
 printf .
-"${ZCAT}" -N --format= in.lz 2> /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --format=, in.lz 2> /dev/null
+"${ZCAT}" -Nq --format=, in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --format=,lz in.lz 2> /dev/null
+"${ZCAT}" -Nq --format=,lz in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --format=gz,,lz in.lz 2> /dev/null
+"${ZCAT}" -Nq --format=gz,,lz in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --format=lz,, in.lz 2> /dev/null
+"${ZCAT}" -Nq --format=lz,, in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --format=nc in.lz 2> /dev/null
+"${ZCAT}" -Nq --format=nc in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --lz='-lzip -q' in.lz 2> /dev/null
+"${ZCAT}" -Nq --lz='-lzip -q' in.lz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCAT}" -N --force-format=gz in.bz2 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCAT}" -N --force-format=bz2 in.lz 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCAT}" -N --force-format=lz in.gz 2> /dev/null
+"${ZCAT}" -Nq --force-format=lz in.gz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCAT}" -N --bad-option 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
@@ -130,16 +138,16 @@ for i in ${extensions}; do
 	printf .
 done
 
-"${ZCMP}" -N in in6 2> /dev/null
+"${ZCMP}" -Nq in in6
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCMP}" -N -n 0 in in6 || fail=1
 "${ZCMP}" -N -n 100 in in6 || fail=1
 "${ZCMP}" -N -n 1000 in in6 || fail=1
 "${ZCMP}" -N -n 10000 in in6 || fail=1
 printf .
-"${ZCMP}" -N in.tar pin.tar > /dev/null
+"${ZCMP}" -Nq in.tar pin.tar
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCMP}" -N -i 0,11 in.tar pin.tar 2> /dev/null
+"${ZCMP}" -Nq -i 0,11 in.tar pin.tar
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCMP}" -N -i 0,11 -n 0 in.tar pin.tar || fail=1
 "${ZCMP}" -N -i 0,11 -n 100 in.tar pin.tar || fail=1
@@ -184,10 +192,10 @@ printf .
 printf .
 "${ZCMP}" -N -q --force-format=lz in.lz
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCMP}" -N --force-format=lz in.gz in.lz 2> /dev/null
+"${ZCMP}" -Nq --force-format=lz in.gz in.lz
 r=$?
 if [ $r = 1 ] || [ $r = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZCMP}" -N -n -1 in in 2> /dev/null
+"${ZCMP}" -Nq -n -1 in in
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZCMP}" -N --bad-option in in 2> /dev/null
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
@@ -263,17 +271,17 @@ if [ $r = 1 ] || [ $r = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 
 mkdir tmp2
-cat in > tmp2/x || framework_failure
-cat in.lz > tmp2/x.lz || framework_failure
-"${ZDIFF}" -N --format=bz2 tmp2/x < /dev/null > /dev/null
+cat in > tmp2/a || framework_failure
+cat in.lz > tmp2/a.lz || framework_failure
+"${ZDIFF}" -N --format=bz2 tmp2/a < /dev/null > /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZDIFF}" -N --format=gz tmp2/x < /dev/null > /dev/null
+"${ZDIFF}" -N --format=gz tmp2/a < /dev/null > /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZDIFF}" -N --format=lz tmp2/x.lz < /dev/null > /dev/null
+"${ZDIFF}" -N --format=lz tmp2/a.lz < /dev/null > /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZDIFF}" -N --format=lz tmp2/x < /dev/null
+"${ZDIFF}" -N --format=lz tmp2/a < /dev/null
 if [ $? = 0 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZDIFF}" -N --format=un tmp2/x.lz < /dev/null
+"${ZDIFF}" -N --format=un tmp2/a.lz < /dev/null
 if [ $? = 0 ] ; then printf . ; else printf - ; fail=1 ; fi
 rm -r tmp2 || framework_failure
 
@@ -303,7 +311,7 @@ for i in ${extensions}; do
 	if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 done
 
-"${ZGREP}" -N "GNU" pin.tar > /dev/null || fail=1
+"${ZGREP}" -N pin.tar -e "GNU" > /dev/null || fail=1
 printf .
 "${ZGREP}" -N "GNU" < pin.tar > /dev/null || fail=1
 printf .
@@ -311,11 +319,13 @@ printf .
 printf .
 "${ZGREP}" -N "nx_pattern" -r . in > /dev/null
 if [ $? != 0 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZGREP}" -N "GNU" in > /dev/null || fail=1
+"${ZGREP}" -N -e "GNU" in > /dev/null || fail=1
 printf .
 "${ZGREP}" -N "GNU" < in > /dev/null || fail=1
 printf .
-"${ZGREP}" -N "GNU" --lz='lzip -q' < in.lz > /dev/null || fail=1
+"${ZGREP}" -N -O lz "nx_pattern" - - < in.lz > /dev/null
+if [ $? != 0 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${ZGREP}" -N -e "-free" --lz='lzip -q' < in.lz > /dev/null || fail=1
 printf .
 "${ZGREP}" -N -- "-free" -in- > /dev/null || fail=1
 printf .
@@ -363,15 +373,17 @@ printf .
 printf .
 "${ZTEST}" -N < in.lz || fail=1
 printf .
+"${ZTEST}" -N - in.gz - < in.lz || fail=1
+printf .
 "${ZTEST}" -N --lz='lzip -q' < in.lz || fail=1
 printf .
 "${ZTEST}" -N -r . || fail=1
 printf .
-"${ZTEST}" -N < in 2> /dev/null
+"${ZTEST}" -Nq < in
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 dd if=in.lz bs=1000 count=1 2> /dev/null | "${ZTEST}" -N -q
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZTEST}" -N --force-format=lz in.bz2 2> /dev/null
+"${ZTEST}" -Nq --force-format=lz in.bz2
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZTEST}" -N --lz='lzip --bad-option' in.lz 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
@@ -381,86 +393,86 @@ if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 
 printf "\ntesting zupdate-%s..." "$2"
 
-cat in.bz2 > x.bz2 || framework_failure
-cat in.gz > x.gz || framework_failure
-"${ZUPDATE}" -N --bz2=bad_command x.bz2 2> /dev/null
+cat in.bz2 > a.bz2 || framework_failure
+cat in.gz > a.gz || framework_failure
+"${ZUPDATE}" -Nq --bz2=bad_command a.bz2
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZUPDATE}" -N --bz2='bzip2 --bad-option' x.bz2 > /dev/null 2>&1
+"${ZUPDATE}" -N --bz2='bzip2 --bad-option' a.bz2 > /dev/null 2>&1
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZUPDATE}" -N --gz=bad_command x.gz 2> /dev/null
+"${ZUPDATE}" -Nq --gz=bad_command a.gz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZUPDATE}" -N --gz='gzip --bad-option' x.gz 2> /dev/null
+"${ZUPDATE}" -N --gz='gzip --bad-option' a.gz 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZUPDATE}" -N --lz=bad_command x.gz 2> /dev/null
+"${ZUPDATE}" -Nq --lz=bad_command a.gz
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${ZUPDATE}" -N --lz='lzip --bad-option' x.gz 2> /dev/null
+"${ZUPDATE}" -N --lz='lzip --bad-option' a.gz 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${ZUPDATE}" -N --bad-option 2> /dev/null
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 
-cat in.lz in.lz > x.lz || framework_failure
-"${ZUPDATE}" -N -f x.bz2 x.gz 2> /dev/null
-if [ $? = 1 ] && [ -e x.bz2 ] && [ -e x.gz ] && [ -e x.lz ] ; then printf .
+cat in.lz in.lz > a.lz || framework_failure
+"${ZUPDATE}" -Nq -f a.bz2 a.gz
+if [ $? = 1 ] && [ -e a.bz2 ] && [ -e a.gz ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
-"${ZUPDATE}" -N x.bz2
-if [ $? = 0 ] && [ ! -e x.bz2 ] && [ -e x.gz ] && [ -e x.lz ] ; then printf .
+"${ZUPDATE}" -N a.bz2
+if [ $? = 0 ] && [ ! -e a.bz2 ] && [ -e a.gz ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
-"${ZUPDATE}" -N x.gz
-if [ $? = 0 ] && [ ! -e x.bz2 ] && [ ! -e x.gz ] && [ -e x.lz ] ; then printf .
+rm -f a.lz || framework_failure
+"${ZUPDATE}" -N a.gz
+if [ $? = 0 ] && [ ! -e a.bz2 ] && [ ! -e a.gz ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
-cat in.bz2 > x.bz2 || framework_failure
-cat in.gz > x.gz || framework_failure
-"${ZUPDATE}" -N x.bz2 x.gz 2> /dev/null
-if [ $? = 1 ] && [ ! -e x.bz2 ] && [ -e x.gz ] && [ -e x.lz ] ; then printf .
+cat in.bz2 > a.bz2 || framework_failure
+cat in.gz > a.gz || framework_failure
+"${ZUPDATE}" -Nq a.bz2 a.gz
+if [ $? = 1 ] && [ ! -e a.bz2 ] && [ -e a.gz ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
-cat in.bz2 > x.bz2 || framework_failure
-cat in.gz > x.gz || framework_failure
-"${ZUPDATE}" -N -f -k x.bz2 x.gz
-if [ $? = 0 ] && [ -e x.bz2 ] && [ -e x.gz ] && [ -e x.lz ] ; then printf .
+cat in.bz2 > a.bz2 || framework_failure
+cat in.gz > a.gz || framework_failure
+"${ZUPDATE}" -N -f -k a.bz2 a.gz
+if [ $? = 0 ] && [ -e a.bz2 ] && [ -e a.gz ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
-cat in.bz2 > x.bz2 || framework_failure
-cat in.gz > x.gz || framework_failure
-"${ZUPDATE}" -N -f x.bz2 x.gz
-if [ $? = 0 ] && [ ! -e x.bz2 ] && [ ! -e x.gz ] &&
-   [ ! -e x ] && [ -e x.lz ] ; then printf .
+cat in.bz2 > a.bz2 || framework_failure
+cat in.gz > a.gz || framework_failure
+"${ZUPDATE}" -N -f a.bz2 a.gz
+if [ $? = 0 ] && [ ! -e a.bz2 ] && [ ! -e a.gz ] &&
+   [ ! -e a ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
-cat in.bz2 > x.bz2 || framework_failure
-"${ZUPDATE}" -N -1 -q x.bz2
-if [ $? = 0 ] && [ ! -e x.bz2 ] && [ -e x.lz ] ; then printf .
+cat in.bz2 > a.bz2 || framework_failure
+"${ZUPDATE}" -N -1 -q a.bz2
+if [ $? = 0 ] && [ ! -e a.bz2 ] && [ -e a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f x.lz || framework_failure
+rm -f a.lz || framework_failure
 
 mkdir tmp2
 mkdir tmp2/tmp3
-cat in.bz2 > tmp2/tmp3/x.bz2 || framework_failure
-cat in.gz > tmp2/tmp3/x.gz || framework_failure
+cat in.bz2 > tmp2/tmp3/a.bz2 || framework_failure
+cat in.gz > tmp2/tmp3/a.gz || framework_failure
 "${ZUPDATE}" -N -r --format=gz tmp2
-if [ $? = 0 ] && [ -e tmp2/tmp3/x.bz2 ] && [ ! -e tmp2/tmp3/x.gz ] &&
-   [ -e tmp2/tmp3/x.lz ] ; then printf .
+if [ $? = 0 ] && [ -e tmp2/tmp3/a.bz2 ] && [ ! -e tmp2/tmp3/a.gz ] &&
+   [ -e tmp2/tmp3/a.lz ] ; then printf .
 else printf - ; fail=1
 fi
-rm -f tmp2/tmp3/x.lz || framework_failure
+rm -f tmp2/tmp3/a.lz || framework_failure
 "${ZUPDATE}" -N -r --format=bz2 tmp2
-if [ $? = 0 ] && [ ! -e tmp2/tmp3/x.bz2 ] && [ ! -e tmp2/tmp3/x.gz ] &&
-   [ -e tmp2/tmp3/x.lz ] ; then printf .
+if [ $? = 0 ] && [ ! -e tmp2/tmp3/a.bz2 ] && [ ! -e tmp2/tmp3/a.gz ] &&
+   [ -e tmp2/tmp3/a.lz ] ; then printf .
 else printf - ; fail=1
 fi
 rm -r tmp2 || framework_failure
diff --git a/zcat.cc b/zcat.cc
index e4f7956..98081c3 100644
--- a/zcat.cc
+++ b/zcat.cc
@@ -1,5 +1,5 @@
 /*  Zcat - decompress and concatenate files to standard output
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
@@ -90,14 +90,14 @@ Line_number line_number;
 
 void show_help()
   {
-  std::printf( "Zcat copies each given file (\"-\" means standard input), to standard\n"
-               "output. If any given file is compressed, its decompressed content is\n"
-               "used. If a given file does not exist, and its name does not end with one\n"
-               "of the known extensions, zcat tries the compressed file names\n"
-               "corresponding to the supported formats. If no files are specified,\n"
-               "data is read from standard input, decompressed if needed, and sent to\n"
-               "standard output. Data read from standard input must be of the same type;\n"
-               "all uncompressed or all in the same compression format.\n"
+  std::printf( "Zcat copies each given file to standard output. If any given file is\n"
+               "compressed, its decompressed content is used. If a given file does not\n"
+               "exist, and its name does not end with one of the known extensions, zcat\n"
+               "tries the compressed file names corresponding to the supported formats.\n"
+               "\nIf no files are specified, or if a file is specified as '-', data is\n"
+               "read from standard input, decompressed if needed, and sent to standard\n"
+               "output. Data read from standard input must be of the same type; all\n"
+               "uncompressed or all in the same compression format.\n"
                "\nThe supported formats are bzip2, gzip, lzip and xz.\n"
                "\nUsage: zcat [options] [files]\n"
                "\nExit status is 0 if no errors occurred, non-zero otherwise.\n"
@@ -346,13 +346,18 @@ int main( const int argc, const char * const argv[] )
   for( ; argind < parser.arguments(); ++argind )
     filenames.push_back( parser.argument( argind ) );
 
-  if( filenames.empty() ) filenames.push_back("-");
+  if( filenames.empty() ) filenames.push_back( "-" );
 
   int retval = 0;
   bool error = false;
+  bool stdin_used = false;
   while( next_filename( filenames, input_filename, error, recursive ) )
     {
-    if( input_filename.empty() ) infd = STDIN_FILENO;
+    if( input_filename.empty() )
+      {
+      if( stdin_used ) continue; else stdin_used = true;
+      infd = STDIN_FILENO;
+      }
     else
       {
       infd = open_instream( input_filename, format_index < 0 );
diff --git a/zcatgrep.cc b/zcatgrep.cc
index 08cd181..d1e2d81 100644
--- a/zcatgrep.cc
+++ b/zcatgrep.cc
@@ -1,5 +1,5 @@
 /*  Common code for zcat and zgrep
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
diff --git a/zcmp.cc b/zcmp.cc
index 68e219e..1cbd384 100644
--- a/zcmp.cc
+++ b/zcmp.cc
@@ -1,5 +1,5 @@
 /*  Zcmp - decompress and compare two files byte by byte
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
@@ -50,11 +50,11 @@ namespace {
 
 void show_help()
   {
-  std::printf( "Zcmp compares two files (\"-\" means standard input), and if they\n"
-               "differ, tells the first byte and line number where they differ. Bytes\n"
-               "and lines are numbered starting with 1. If any given file is compressed,\n"
-               "its decompressed content is used. Compressed files are decompressed on\n"
-               "the fly; no temporary files are created.\n"
+  std::printf( "Zcmp compares two files ('-' means standard input), and if they differ,\n"
+               "tells the first byte and line number where they differ. Bytes and lines\n"
+               "are numbered starting with 1. If any given file is compressed, its\n"
+               "decompressed content is used. Compressed files are decompressed on the\n"
+               "fly; no temporary files are created.\n"
                "\nThe supported formats are bzip2, gzip, lzip and xz.\n"
                "\nUsage: zcmp [options] file1 [file2]\n"
                "\nCompares <file1> to <file2>. If <file2> is omitted zcmp tries the\n"
@@ -106,9 +106,8 @@ long long getnum( const char * const ptr, const char ** const tailp = 0,
 
   if( !errno && tail[0] && std::isalpha( tail[0] ) )
     {
-    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
-    int exponent = 0;
-    bool bad_multiplier = false;
+    const int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
+    int exponent = 0;				// 0 = bad multiplier
     switch( tail[0] )
       {
       case 'Y': exponent = 8; break;
@@ -118,13 +117,10 @@ long long getnum( const char * const ptr, const char ** const tailp = 0,
       case 'T': exponent = 4; break;
       case 'G': exponent = 3; break;
       case 'M': exponent = 2; break;
-      case 'K': if( factor == 1024 ) exponent = 1; else bad_multiplier = true;
-                break;
-      case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
-                break;
-      default : bad_multiplier = true;
+      case 'K': if( factor == 1024 ) exponent = 1; break;
+      case 'k': if( factor == 1000 ) exponent = 1; break;
       }
-    if( bad_multiplier )
+    if( exponent <= 0 )
       {
       show_error( "Bad multiplier in numerical argument.", 0, true );
       std::exit( 2 );
@@ -298,7 +294,7 @@ int cmp( const long long max_size, const int infd[2],
       if( verbosity >= 0 )
         std::fprintf( stderr, "%s: EOF on %s\n",
                       program_name, filenames[rd[1]<rd[0]].c_str() );
-        return 1;
+      return 1;
       }
     if( min_rd != buffer_size ) break;
     }
diff --git a/zcmpdiff.cc b/zcmpdiff.cc
index 524b863..6de2eac 100644
--- a/zcmpdiff.cc
+++ b/zcmpdiff.cc
@@ -1,5 +1,5 @@
 /*  Common code for zcmp and zdiff
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
diff --git a/zdiff.cc b/zdiff.cc
index 1e03356..26a7365 100644
--- a/zdiff.cc
+++ b/zdiff.cc
@@ -1,5 +1,5 @@
 /*  Zdiff - decompress and compare two files line by line
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
@@ -48,7 +48,7 @@ std::string fifonames[2];	// names of the two fifos passed to diff
 
 void show_help()
   {
-  std::printf( "Zdiff compares two files (\"-\" means standard input), and if they\n"
+  std::printf( "Zdiff compares two files ('-' means standard input), and if they\n"
                "differ, shows the differences line by line. If any given file is\n"
                "compressed, its decompressed content is used. Zdiff is a front end to\n"
                "the diff program and has the limitation that messages from diff refer to\n"
@@ -123,12 +123,14 @@ bool set_fifonames( const std::string filenames[2] )
   if( p ) { fifonames[0] = p; fifonames[0] += '/'; }
   else fifonames[0] = "/tmp/";
   int n = getpid();
-  const unsigned pos = fifonames[0].size();
+  unsigned pos = fifonames[0].size();
   do fifonames[0].insert( pos, 1, codes[n % num_codes] );
   while( n /= num_codes );
+  pos = fifonames[0].size();
   fifonames[1] = fifonames[0];
   fifonames[0] += '_'; fifonames[0] += my_basename( filenames[0].c_str() );
-  fifonames[1] += '-'; fifonames[1] += my_basename( filenames[1].c_str() );
+  fifonames[1] += '_'; fifonames[1] += my_basename( filenames[1].c_str() );
+  if( fifonames[1] == fifonames[0] ) fifonames[1][pos] = '-';
 
   for( int i = 0; i < 2; ++i )
     if( mkfifo( fifonames[i].c_str(), S_IRUSR | S_IWUSR ) != 0 )
@@ -180,7 +182,7 @@ bool set_data_feeder( const std::string & fifoname, const int infd,
       if( outfd < 0 )
         {
         if( verbosity >= 0 )
-          std::fprintf( stderr, "%s: Can't open FIFO '%s' for writing: %s.\n",
+          std::fprintf( stderr, "%s: Can't open FIFO '%s' for writing: %s\n",
                         program_name, fifoname.c_str(), std::strerror( errno ) );
         _exit( 2 );
         }
@@ -219,7 +221,7 @@ bool set_data_feeder( const std::string & fifoname, const int infd,
       if( outfd < 0 )
         {
         if( verbosity >= 0 )
-          std::fprintf( stderr, "%s: Can't open FIFO '%s' for writing: %s.\n",
+          std::fprintf( stderr, "%s: Can't open FIFO '%s' for writing: %s\n",
                         program_name, fifoname.c_str(), std::strerror( errno ) );
         _exit( 2 );
         }
diff --git a/zgrep.cc b/zgrep.cc
index 98899cd..6c8ceb1 100644
--- a/zgrep.cc
+++ b/zgrep.cc
@@ -1,5 +1,5 @@
 /*  Zgrep - search compressed files for a regular expression
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
@@ -52,10 +52,11 @@ void show_help()
                "file is compressed, its decompressed content is used. If a given file\n"
                "does not exist, and its name does not end with one of the known\n"
                "extensions, zgrep tries the compressed file names corresponding to the\n"
-               "supported formats. If no files are specified, data is read from\n"
-               "standard input, decompressed if needed, and fed to grep. Data read from\n"
-               "standard input must be of the same type; all uncompressed or all\n"
-               "in the same compression format.\n"
+               "supported formats.\n"
+               "\nIf no files are specified, or if a file is specified as '-', data is\n"
+               "read from standard input, decompressed if needed, and fed to grep. Data\n"
+               "read from standard input must be of the same type; all uncompressed or\n"
+               "all in the same compression format.\n"
                "\nThe supported formats are bzip2, gzip, lzip and xz.\n"
                "\nUsage: zgrep [options] <pattern> [files]\n"
                "\nExit status is 0 if match, 1 if no match, 2 if trouble.\n"
@@ -337,16 +338,21 @@ int main( const int argc, const char * const argv[] )
   for( ; argind < parser.arguments(); ++argind )
     filenames.push_back( parser.argument( argind ) );
 
-  if( filenames.empty() ) filenames.push_back("-");
+  if( filenames.empty() ) filenames.push_back( "-" );
 
   if( show_name < 0 ) show_name = ( filenames.size() != 1 || recursive );
 
   int retval = 1;
   bool error = false;
+  bool stdin_used = false;
   while( next_filename( filenames, input_filename, error, recursive,
                         false, no_messages ) )
     {
-    if( input_filename.empty() ) infd = STDIN_FILENO;
+    if( input_filename.empty() )
+      {
+      if( stdin_used ) continue; else stdin_used = true;
+      infd = STDIN_FILENO;
+      }
     else
       {
       infd = open_instream( input_filename, format_index < 0, no_messages );
diff --git a/ztest.cc b/ztest.cc
index 5377c6d..8d9d8cd 100644
--- a/ztest.cc
+++ b/ztest.cc
@@ -1,5 +1,5 @@
 /*  Ztest - verify integrity of compressed files
-    Copyright (C) 2010-2015 Antonio Diaz Diaz.
+    Copyright (C) 2010-2016 Antonio Diaz Diaz.
 
     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
@@ -51,9 +51,10 @@ namespace {
 void show_help()
   {
   std::printf( "Ztest verifies the integrity of the specified compressed files.\n"
-               "Uncompressed files are ignored. If no files are specified, the integrity\n"
-               "of compressed data read from standard input is verified. Data read from\n"
-               "standard input must be all in the same compression format.\n"
+               "Uncompressed files are ignored. If no files are specified, or if a file\n"
+               "is specified as '-', the integrity of compressed data read from standard\n"
+               "input is verified. Data read from standard input must be all in the same\n"
+               "compression format.\n"
                "\nThe supported formats are bzip2, gzip, lzip and xz.\n"
                "\nNote that some xz files lack integrity information, and therefore can't\n"
                "be verified as reliably as the other formats can.\n"
@@ -270,13 +271,18 @@ int main( const int argc, const char * const argv[] )
   for( ; argind < parser.arguments(); ++argind )
     filenames.push_back( parser.argument( argind ) );
 
-  if( filenames.empty() ) filenames.push_back("-");
+  if( filenames.empty() ) filenames.push_back( "-" );
 
   int retval = 0;
   bool error = false;
+  bool stdin_used = false;
   while( next_filename( filenames, input_filename, error, recursive ) )
     {
-    if( input_filename.empty() ) infd = STDIN_FILENO;
+    if( input_filename.empty() )
+      {
+      if( stdin_used ) continue; else stdin_used = true;
+      infd = STDIN_FILENO;
+      }
     else
       {
       infd = open_instream( input_filename );
diff --git a/zupdate.cc b/zupdate.cc
index 6a94c70..7f08504 100644
--- a/zupdate.cc
+++ b/zupdate.cc
@@ -1,5 +1,5 @@
-/*  Zupdate - recompress bzip2, gzip, xz files to lzip files
-    Copyright (C) 2013-2015 Antonio Diaz Diaz.
+/*  Zupdate - recompress bzip2, gzip, xz files to lzip format
+    Copyright (C) 2013-2016 Antonio Diaz Diaz.
 
     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
@@ -72,7 +72,7 @@ void show_help()
                "\nOptions:\n"
                "  -h, --help                 display this help and exit\n"
                "  -V, --version              output version information and exit\n"
-               "  -f, --force                do not skip a file even if the .lz exists\n"
+               "  -f, --force                don't skip a file even if the .lz exists\n"
                "  -k, --keep                 keep (don't delete) input files\n"
                "  -l, --lzip-verbose         pass a -v option to the lzip compressor\n"
                "  -M, --format=<list>        process only the formats in <list>\n"
@@ -94,10 +94,10 @@ int cant_execute( const std::string & command, const int status )
   if( verbosity >= 0 )
     {
     if( WIFEXITED( status ) )
-      std::fprintf( stderr, "%s: Error executing '%s'. Exit status = %d.\n",
+      std::fprintf( stderr, "%s: Error executing '%s'. Exit status = %d\n",
                     program_name, command.c_str(), WEXITSTATUS( status ) );
     else
-      std::fprintf( stderr, "%s: Can't execute '%s'.\n",
+      std::fprintf( stderr, "%s: Can't execute '%s'\n",
                     program_name, command.c_str() );
     }
   return 1;
@@ -162,7 +162,7 @@ int zupdate_file( const std::string & name, const char * const lzip_name,
   if( stat( name.c_str(), &in_stats ) != 0 )		// check input file
     {
     if( verbosity >= 0 )
-      std::fprintf( stderr, "%s: Can't stat input file '%s': %s.\n",
+      std::fprintf( stderr, "%s: Can't stat input file '%s': %s\n",
                     program_name, name.c_str(), std::strerror( errno ) );
     return 1;
     }
@@ -198,7 +198,7 @@ int zupdate_file( const std::string & name, const char * const lzip_name,
   if( !lz_exists )					// recompress
     {
     if( verbosity >= 1 )
-      std::fprintf( stderr, "Recompressing file '%s'.\n", name.c_str() );
+      std::fprintf( stderr, "Recompressing file '%s'\n", name.c_str() );
     int fda[2];			// pipe between decompressor and compressor
     if( pipe( fda ) < 0 )
       { show_error( "Can't create pipe", errno ); return 1; }
@@ -262,13 +262,14 @@ int zupdate_file( const std::string & name, const char * const lzip_name,
 
   {
   if( lz_exists && verbosity >= 1 )
-    std::fprintf( stderr, "Comparing file '%s'.\n", name.c_str() );
+    std::fprintf( stderr, "Comparing file '%s'\n", name.c_str() );
   std::string zcmp_command( invocation_name );
   unsigned i =  zcmp_command.size();
   while( i > 0 && zcmp_command[i-1] != '/' ) --i;
   zcmp_command.resize( i );
   zcmp_command += "zcmp ";				// ${bindir}zcmp
   if( no_rcfile ) zcmp_command += "-N ";
+  if( verbosity < 0 ) zcmp_command += "-q ";
   zcmp_command += name; zcmp_command += ' '; zcmp_command += rname;
   int status = std::system( zcmp_command.c_str() );
   if( status != 0 )
@@ -279,7 +280,7 @@ int zupdate_file( const std::string & name, const char * const lzip_name,
   if( !keep_input_files && std::remove( name.c_str() ) != 0 && errno != ENOENT )
     {
     if( verbosity >= 0 )
-      std::fprintf( stderr, "%s: Can't delete input file '%s': %s.\n",
+      std::fprintf( stderr, "%s: Can't delete input file '%s': %s\n",
                     program_name, name.c_str(), std::strerror( errno ) );
     return 1;
     }
diff --git a/zutils.cc b/zutils.cc
index 02f13ac..460ceec 100644
--- a/zutils.cc
+++ b/zutils.cc
@@ -1,5 +1,5 @@
 /*  Zutils - Utilities dealing with compressed files
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     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
@@ -61,7 +61,7 @@ int child_status( const pid_t pid, const char * const name )
     if( tmp == -1 && errno != EINTR )
       {
       if( verbosity >= 0 )
-        std::fprintf( stderr, "%s: Error checking status of '%s': %s.\n",
+        std::fprintf( stderr, "%s: Error checking status of '%s': %s\n",
                       program_name, name, std::strerror( errno ) );
       _exit( 2 );
       }
diff --git a/zutils.h b/zutils.h
index c96d7c1..d91ca52 100644
--- a/zutils.h
+++ b/zutils.h
@@ -1,5 +1,5 @@
 /*  Zutils - Utilities dealing with compressed files
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     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