.\"	$OpenBSD: zdiff.1,v 1.3 2003/12/28 14:56:13 jmc Exp $
.\"
.\" Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\" Sponsored in part by the Defense Advanced Research Projects
.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
.\"
.Dd June 23, 2003
.Dt ZDIFF 1
.Os
.Sh NAME
.Nm zcmp ,
.Nm zdiff
.Nd compare compressed files
.Sh SYNOPSIS
.Nm zcmp
.Op Ar options
.Ar file
.Op Ar file2
.Nm zdiff
.Op Ar options
.Ar file
.Op Ar file2
.Sh DESCRIPTION
.Nm zcmp
and
.Nm zdiff
are filters that invoke
.Xr cmp 1
or
.Xr diff 1
respectively to compare compressed files.
Such files generally have a
.Dq Z
or
.Dq gz
extension (both the
.Xr compress 1
and
.Xr gzip 1
formats are supported).
Any
.Ar options
that are specified are passed to
.Xr cmp 1
or
.Xr diff 1 .
.Pp
If only
.Ar file1
is specified, it is compared against a file with the same name, but
with the extension removed.
When both
.Ar file1
or
.Ar file2
are specified, either file may be compressed.
.Sh ENVIRONMENT
.Bl -tag -width "TMPDIR"
.It Ev TMPDIR
Directory in which to place temporary files.
If unset,
.Pa /tmp
is used.
.El
.Sh FILES
.Bl -tag -width "/tmp/zdiff.XXXXXXXXXX" -compact
.It Pa /tmp/zcmp.XXXXXXXXXX
Temporary file for
.Nm zcmp .
.It Pa /tmp/zdiff.XXXXXXXXXX
Temporary file for
.Nm zdiff .
.El
.Sh SEE ALSO
.Xr cmp 1 ,
.Xr compress 1 ,
.Xr diff 1
.Sh CAVEATS
.Nm zcmp
and
.Nm 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:
.Bl -dash
.It
directories
.It
device special files
.It
filenames indicating the standard input
.Pq Dq \-
.El