zcmp, zdiff − compare compressed files

zcmp [ cmp_options ] file1 [ file2 ]
zdiff [ diff_options ] file1 [ file2 ]

Zcmp and zdiff are used to invoke the cmp or the diff
program on files compressed via All options specified are
passed directly to cmp or If only file1 is specified, it is
compared to the uncompressed contents of If two files are
specified, their contents (uncompressed if necessary) are
fed to cmp or The input files are not modified.  The exit
status from cmp or diff is preserved.

cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1),
gzip(1), gzexe(1)

Messages from the cmp or diff programs may refer to file
names such as "−" instead of to the file names specified.