zcmp --version (return code: 0)
zcmp (gzip) 1.6
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
Written by Paul Eggert.
zcmp --help (return code: 0)
Usage: /bin/zcmp [OPTION]... FILE1 [FILE2]
Compare FILE1 to FILE2 byte by byte, using their uncompressed contents
if they are compressed. If FILE2 is omitted, compare FILE1 to the
uncompressed contents of FILE1.gz. Do comparisons like 'cmp' does.
Options are the same as for 'cmp'.
If a FILE is '-' or missing, read standard input.
Report bugs to <bug-gzip@gnu.org>.