man 1 ZDIFF

ZDIFF(1)                    General Commands Manual                   ZDIFF(1)

NAME
       zcmp, zdiff - compare compressed files

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

DESCRIPTION
       The zcmp and zdiff commands are used to invoke the cmp or the diff pro-
       gram on files compressed via gzip.  All options  specified  are  passed
       directly to cmp or diff.  If only file1 is specified, it is compared to
       the uncompressed contents of file1.gz.  If  two  files  are  specified,
       their contents (uncompressed if necessary) are fed to cmp or diff.  The
       input files are not modified.  The exit status from cmp or diff is pre-
       served.

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 may refer to file names such  as
       "-" instead of to the file names specified.

                                                                      ZDIFF(1)