GZIP(1) | General Commands Manual | GZIP(1) |
gzip
, gunzip
,
zcat
—
compression/decompression tool using Lempel-Ziv coding
(LZ77)
gzip |
[-cdfhkLlNnqrtVv ] [-S
suffix] file
[file [...]] |
gunzip |
[-cfhkLNqrtVv ] [-S
suffix] file
[file [...]] |
zcat |
[-fhV ] file
[file [...]] |
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 output. When in
compression mode, each file will be replaced with
another file with the suffix, 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. Each file argument must contain a separate complete archive; when multiple files are indicated, each is decompressed in turn.
In the case of gzcat
the resulting data is
then concatenated in the manner of
cat(1).
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),
bzip2(1), lzip, or
xz(1).
The following options are available:
-1
,
--fast
-2
,
-3
, -4
,
-5
, -6
,
-7
, -8
-9
,
--best
-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
-d
,
--decompress
,
--uncompress
-f
,
--force
-c
option, allowing non-compressed data to pass
through unchanged.-h
,
--help
-k
,
--keep
gzip
from deleting input
files after (de)compression.-L
,
--license
gzip
license.-l
,
--list
-v
option, it also displays the compression
method, CRC, date and time embedded in the file.-N
,
--name
-n
,
--no-name
-q
,
--quiet
-r
,
--recursive
gzip
the files in a
directory tree individually, using the
fts(3) library.-S
suffix, --suffix
suffix-t
,
--test
-V
,
--version
gzip
program.-v
,
--verbose
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
.
The gzip
utility exits 0 on
success, 1 on errors, and 2 if a warning occurs.
gzip
responds to the following
signals:
SIGINFO
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-compatible with the original GNU
gzip
program for NetBSD
2.0.
This implementation of gzip
was ported
based on the NetBSD gzip
version 20181111, and first appeared in FreeBSD
7.0.
This implementation of gzip
was written by
Matthew R. Green
<mrg@eterna.com.au>
with unpack support written by Xin LI
<delphij@FreeBSD.org>.
According to RFC 1952, the recorded file size is stored in a
32-bit integer, therefore, it cannot represent files larger than 4GB. This
limitation also applies to -l
option of
gzip
utility.
January 7, 2019 | macOS 14.6 |