ZDIFF(1)                   OpenBSD Reference Manual                   ZDIFF(1)

NAME
     zcmp, zdiff - compare compressed files

SYNOPSIS
     zcmp [options] file1 [file2]
     zdiff [options] file1 [file2]

DESCRIPTION
     zcmp and zdiff are filters that invoke cmp(1) or diff(1) respectively to
     compare compressed files.  Such files generally have a ``Z'' or ``gz''
     extension (both the compress(1) and gzip(1) formats are supported).  Any
     options that are specified are passed to cmp(1) or diff(1).

     If only file1 is specified, it is compared against a file with the same
     name, but with the extension removed.  When both file1 or file2 are
     specified, either file may be compressed.

ENVIRONMENT
     TMPDIR  Directory in which to place temporary files.  If unset, /tmp is
             used.

FILES
     /tmp/zcmp.XXXXXXXXXX   Temporary file for zcmp.
     /tmp/zdiff.XXXXXXXXXX  Temporary file for zdiff.

SEE ALSO
     cmp(1), compress(1), diff(1), gzip(1)

CAVEATS
     zcmp and zdiff rely solely on the file extension to determine what is, or
     is not, a compressed file.  Consequently, the following are not supported
     as arguments:

           -   directories
           -   device special files
           -   filenames indicating the standard input (`-')

OpenBSD 4.9                      May 31, 2007                      OpenBSD 4.9