189 lines
4.8 KiB
Groff
189 lines
4.8 KiB
Groff
.\" $NetBSD: gzip.1,v 1.2 2003/12/23 08:19:49 jdolecek Exp $
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.\"
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.\" Copyright (c) 1997, 2003 Matthew R. Green
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd December 22, 2003
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.Dt GZIP 1
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.Os
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.Sh NAME
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.Nm gzip
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.Nd compression/decompression tool using Lempel-Ziv coding (LZ77)
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.Sh SYNOPSIS
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.Nm
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.Op Fl cdfhnqrtvVN
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.Op Fl S Ar suffix
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.Ar file
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.Oo
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.Ar file Oo ...
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.Oc
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.Oc
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.Nm gunzip
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.Op Fl cfhNqrtvV
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.Op Fl S Ar suffix
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.Ar file
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.Oo
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.Ar file Oo ...
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.Oc
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.Oc
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.Nm zcat
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.Op Fl fhV
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.Ar file
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.Oo
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.Ar file Oo ...
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.Oc
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.Oc
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.Sh DESCRIPTION
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The
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.Nm
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program compresses and decompresses files using Lempel-Ziv coding (LZ77).
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If no
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.Ar files
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are specified,
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.Nm
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will compress from standard input, or decompress to standard output.
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When in compression mode, each
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.Ar file
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will be replaced with another file with the suffix, set by the
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.Fl S Ar suffix
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option, added, if possible.
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In decompression mode, each
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.Ar file
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will be checked for existance, as will the file with the suffix added.
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.Pp
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If invoked as
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.Nm gunzip
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then the
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.Fl d
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option is enabled.
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If invoked as
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.Nm zcat
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or
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.Nm gzcat
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then both the
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.Fl d
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and
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.Fl c
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options are enabled.
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.Sh OPTIONS
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The following options are available:
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.Bl -tag -width Sxxxsuffix
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.It Fl c , -stdout , -to-stdout
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This option specifies that output will go to the standard output stream,
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leaving files intact.
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.It Fl d , -decompress , -uncompress
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This option selects decompression rather than compression.
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.It Fl f , -force
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This option turns on force mode.
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This allows files with multiple links, overwriting of pre-existing files,
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reading from or writing to a terminal,
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and when combined with the
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.Fl c
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option, allowing non-compressed data to pass through unchanged.
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.It Fl h , -help
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This option prints a usage summary and exits.
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.It Fl n , -no-name
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This option stops the filename from being stored in the output file.
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.It Fl N , -name
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This option causes the stored filename in the input file to be used
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as the output file.
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.It Fl q , -quiet
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With this option, no warnings or errors are printed.
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.It Fl r , -recursive
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This option is used to
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.Nm
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the files in a directory tree individually, using the
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.Xr fts 3
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library.
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.It Fl S Ar suffix , Fl -suffix Ar suffix
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This option changes the default suffix from .gz to
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.Ar suffix .
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.It Fl t , -test
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This option will test compressed files for integrity.
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.It Fl v , -verbose
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This option turns on verbose mode, which prints the compression ratio
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for each files compressed.
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.It Fl V , -version
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This option prints the version of the
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.Nm
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program.
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.It Fl 1 , -fast
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.It Fl 2
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.It Fl 3
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.It Fl 4
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.It Fl 5
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.It Fl 6
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.It Fl 7
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.It Fl 8
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.It Fl 9 , -best
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These options change the compression level used, with the
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.Fl 1
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option being the fastest, with less compression, and the
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.Fl 9
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option being the slowest, with optimal compression.
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.El
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.Sh SEE ALSO
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.Xr fts 3 ,
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.Xr zlib 3
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.Sh HISTORY
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The
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.Nm
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program was originally written by Jean-loup Gailly, licensed under the GNU Public
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Licence.
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Matthew R. Green wrote a simple front end for
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.Nx 1.3
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distribution media, based on the freely redistributable zlib library.
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It was enhanced to be mostly feature-compatible with the original GNU
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.Nm
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program for
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.Nx 2.0 .
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.Sh AUTHORS
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The
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.Nx
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.Nm
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program was written by
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.An Matthew R. Green Aq mrg@eterna.com.au .
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.Sh BUGS
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The
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.Nx
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.Nm
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program does not print the compression ratio when not using files.
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.Pp
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The
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.Nx
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.Nm
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program does not support long options supported by the GNU
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.Nm .
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.Pp
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The
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.Nx
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.Nm
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program depends on
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.Nx
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specific enhancements to the
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.Xr zlib 3
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library.
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