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NetBSD 6.1.5 - man page for gzip (netbsd section 1)

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GZIP(1) 			   BSD General Commands Manual				  GZIP(1)

NAME
     gzip -- compression/decompression tool using Lempel-Ziv coding (LZ77)

SYNOPSIS
     gzip [-cdfhlNnqrtVv] [-S suffix] file [file [...]]
     gunzip [-cfhNqrtVv] [-S suffix] file [file [...]]
     zcat [-fhV] file [file [...]]

DESCRIPTION
     The gzip program compresses and decompresses files using Lempel-Ziv coding (LZ77).  If no
     files are specified, gzip will compress from standard input, or decompress to standard out-
     put.  When in compression mode, each file will be replaced with another file with the suf-
     fix, set by the -S suffix option, added, if possible.  In decompression mode, each file will
     be checked for existence, as will the file with the suffix added.

     If invoked as gunzip then the -d option is enabled.  If invoked as zcat or gzcat then both
     the -c and -d options are enabled.

     This version of gzip is also capable of decompressing files compressed using compress(1) or
     bzip2(1).

OPTIONS
     The following options are available:

     -1, --fast

     -2

     -3

     -4

     -5

     -6

     -7

     -8

     -9, --best        These options change the compression level used, with the -1 option being
		       the fastest, with less compression, and the -9 option being the slowest,
		       with optimal compression.  The default compression level is 6.

     -c, --stdout, --to-stdout
		       This option specifies that output will go to the standard output stream,
		       leaving files intact.

     -d, --decompress, --uncompress
		       This option selects decompression rather than compression.

     -f, --force       This option turns on force mode.  This allows files with multiple links,
		       overwriting of pre-existing files, reading from or writing to a terminal,
		       and when combined with the -c option, allowing non-compressed data to pass
		       through unchanged.

     -h, --help        This option prints a usage summary and exits.

     -l, --list        This option displays information about the file's compressed and uncom-
		       pressed size, ratio, uncompressed name.	With the -v option, it also dis-
		       plays the compression method, CRC, date and time embedded in the file.

     -N, --name        This option causes the stored filename in the input file to be used as the
		       output file.

     -n, --no-name     This option stops the filename and timestamp from being stored in the out-
		       put file.

     -q, --quiet       With this option, no warnings or errors are printed.

     -r, --recursive   This option is used to gzip the files in a directory tree individually,
		       using the fts(3) library.

     -S suffix, --suffix suffix
		       This option changes the default suffix from .gz to suffix.

     -t, --test        This option will test compressed files for integrity.

     -V, --version     This option prints the version of the gzip program.

     -v, --verbose     This option turns on verbose mode, which prints the compression ratio for
		       each file compressed.

ENVIRONMENT
     If the environment variable GZIP is set, it is parsed as a white-space separated list of
     options handled before any options on the command line.  Options on the command line will
     override anything in GZIP.

SEE ALSO
     bzip2(1), compress(1), xz(1), fts(3), zlib(3)

HISTORY
     The gzip program was originally written by Jean-loup Gailly, licensed under the GNU Public
     Licence.  Matthew R. Green wrote a simple front end for NetBSD 1.3 distribution media, based
     on the freely re-distributable zlib library.  It was enhanced to be mostly feature-compati-
     ble with the original GNU gzip program for NetBSD 2.0.

     This manual documents NetBSD gzip version 20040427.

AUTHORS
     This implementation of gzip was written by Matthew R. Green <mrg@eterna.com.au>.

BSD					  June 18, 2011 				      BSD
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