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+.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
+.IR  Zgrep
+is used to invoke the
+.I grep
+on 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 decompressed
+if necessary and fed to grep.
+Otherwise the given files are uncompressed if necessary and fed to
+.I grep.
+.PP
+If
+.I zgrep
+is invoked as
+.I zegrep
+or
+.I zfgrep
+then
+.I egrep
+or
+.I fgrep
+is used instead of
+.I grep.
+If the GREP environment variable is set,
+.I zgrep
+uses it as the
+.I grep
+program to be invoked. For example:
+
+    for sh:  GREP=fgrep  zgrep string files
+    for csh: (setenv GREP fgrep; zgrep string files)
+.SH AUTHOR
+Charles 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)