.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 or gzipped files.
These
.I grep
options will cause
.I zgrep
to terminate with an error code:
.BI (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*) .
All other 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 CODE
2 - An option that is not supported was specified.
.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)