zdiff

NAME
  zcmp, zdiff - compare compressed files

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

DESCRIPTION
  Zcmp and zdiff are used to invoke the cmp or the diff
  program on compressed files.  All options specified are
  passed directly to cmp or diff.  If only 1 file is
  specified, then the files compared are file1 and an
  uncompressed file1.gz.  If two files are specified, then
  they are uncompressed if necessary and fed to cmp or diff.
  The exit status from cmp or diff is preserved.

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

BUGS
  Messages from the cmp or diff programs refer to temporary
  filenames instead of those specified.