freebsd-dev/usr.bin/gzip/zdiff.1
Xin LI 9a9ea25f4a Replace the GNU gzip with a slightly modified NetBSD gzip. The
NetBSD version is a feature-to-feature re-implementation of GNU
gzip using the freely-redistributable zlib and this version is
expected to be mostly bug-to-bug compatible with the GNU
implementation.

 - Because this is a piece of mature code and we want to make
   changes so it is added directly rather than importing to
   src/contrib.
 - Connect newly added code to src/usr.bin/ and rescue/rescue
   build.
 - Disconnect the GNU gzip code from build for now, they will
   be eventually removed completely.
 - Provide two new src.conf(5) knobs, WITHOUT_BZIP2_SUPPORT and
   WITHOUT_BZIP2.

Tested by:	kris (full exp-7 pointyhat build)
Approved by:	core (importing a 4-clause BSD licensed file)
Approved by:	re (adding new utility during -HEAD code slush)
2007-01-26 10:19:08 +00:00

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.\" $NetBSD: zdiff.1,v 1.3 2003/12/28 12:48:03 wiz Exp $
.\" $OpenBSD: zdiff.1,v 1.2 2003/07/13 17:39:14 millert 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.
.\"
.\" $FreeBSD$
.Dd January 26, 2007
.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