.TH ZGREP 1
.SH NAME
zgrep \- search possibly compressed files for a regular expression
.SH SYNOPSIS
.B zgrep
[ grep_options ]
.BI  [\ -e\ ] " pattern"
.IR filename ".\|.\|."
.SH DESCRIPTION
.I Zgrep
invokes
.I grep
on compressed, xz'ed, lzma'ed, zstd'ed, bzip2'ed or gzipped files.
All options specified are passed directly to
.IR grep .
If no file is specified, then the standard input is decompressed
if necessary and fed to grep.
Otherwise the given files are uncompressed if necessary and fed to
.IR grep .
.PP
If the GREP environment variable is set,
.I zgrep
uses it as the
.I grep
program to be invoked.
.SH "EXIT STATUS"
Exit status is 0 for a match, 1 for no matches, and 2 if trouble.
.SH BUGS
.PP
The following
.I grep
options are not supported:
.B --dereference-recursive
.RB ( \-R ),
.B --directories
.RB ( \-d ),
.BR --exclude ,
.BR --exclude-from ,
.BR --exclude-dir ,
.BR --include ,
.B --null
.RB ( \-Z ),
.B --null-data
.RB ( \-z ),
and
.B --recursive
.RB ( \-r ).
.SH AUTHOR
Charles Levert (charles@comm.polymtl.ca)
.SH "SEE ALSO"
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)