.TH ZGREP 1.SH NAMEzgrep \- search possibly compressed files for a regular expression.SH SYNOPSIS.B zgrep[ grep_options ].BI  [\ -e\ ] " pattern".IR filename ".\|.\|.".SH DESCRIPTION.IR  Zgrepis used to invoke the.I grepon compress'ed or gzip'ed files. All options specified are passed directly to.I grep.If no file is specified, then the standard input is decompressedif necessary and fed to grep.Otherwise the given files are uncompressed if necessary and fed to.I grep..PPIf.I zgrepis invoked as.I zegrepor.I zfgrepthen.I egrepor.I fgrepis used instead of.I grep.If the GREP environment variable is set,.I zgrepuses it as the.I grepprogram to be invoked. For example:    for sh:  GREP=fgrep  zgrep string files    for csh: (setenv GREP fgrep; zgrep string files).SH AUTHORCharles Levert (charles@comm.polymtl.ca).SH "SEE ALSO"grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1),gzip(1), gzexe(1)