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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:43:11 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:43:11 +0000 |
commit | fc22b3d6507c6745911b9dfcc68f1e665ae13dbc (patch) | |
tree | ce1e3bce06471410239a6f41282e328770aa404a /upstream/fedora-rawhide/man1/gzip.1 | |
parent | Initial commit. (diff) | |
download | manpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.tar.xz manpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.zip |
Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'upstream/fedora-rawhide/man1/gzip.1')
-rw-r--r-- | upstream/fedora-rawhide/man1/gzip.1 | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/upstream/fedora-rawhide/man1/gzip.1 b/upstream/fedora-rawhide/man1/gzip.1 new file mode 100644 index 00000000..657ad0d6 --- /dev/null +++ b/upstream/fedora-rawhide/man1/gzip.1 @@ -0,0 +1,577 @@ +.TH GZIP 1 local +.SH NAME +gzip, gunzip, zcat \- compress or expand files +.SH SYNOPSIS +.ll +8 +.B gzip +.RB [ " \-acdfhklLnNrtvV19 " ] +.RB [ \-S\ suffix ] +[ +.I "name \&..." +] +.ll -8 +.br +.B gunzip +.RB [ " \-acfhklLnNrtvV " ] +.RB [ \-S\ suffix ] +[ +.I "name \&..." +] +.br +.B zcat +.RB [ " \-fhLV " ] +[ +.I "name \&..." +] +.SH DESCRIPTION +The +.B gzip +command +reduces the size of the named files using Lempel-Ziv coding (LZ77). +Whenever possible, +each file is replaced by one with the extension +.BR "\&.gz" , +while keeping the same ownership modes, access and modification times. +(The default extension is +.B "z" +for MSDOS, OS/2 FAT, Windows NT FAT and Atari.) +If no files are specified, or if a file name is "\-", +the standard input is compressed to the standard output. +The +.B gzip +command +will only attempt to compress regular files. +In particular, it will ignore symbolic links. +.PP +If the compressed file name is too long for its file system, +.B gzip +truncates it. +The +.B gzip +command +attempts to truncate only the parts of the file name longer than 3 characters. +(A part is delimited by dots.) If the name consists of small parts only, +the longest parts are truncated. +For example, if file names are limited to 14 characters, +gzip.msdos.exe is compressed to gzi.msd.exe.gz. +Names are not truncated on systems which do not have a limit on file name +length. +.PP +By default, +.B gzip +keeps the original file name and timestamp in the compressed file. +These are used when decompressing the file with the +.B \-N +option. +This is useful when the compressed file name was truncated or +when the timestamp was not preserved after a file transfer. +.PP +Compressed files can be restored to their original form using +.B "gzip \-d" +or +.B gunzip +or +.BR zcat . +If the original name saved in the compressed file is not suitable for its +file system, a new name is constructed from the original one to make it valid. +.PP +.B gunzip +takes a list of files on its command line and replaces each +file whose name ends with .gz, \-gz, .z, \-z, or _z (ignoring case) +and which begins with the correct magic number with an uncompressed +file without the original extension. +.B gunzip +also recognizes the special extensions +.B "\&.tgz" +and +.B "\&.taz" +as shorthands for +.B "\&.tar.gz" +and +.B "\&.tar.Z" +respectively. +When compressing, +.B gzip +uses the +.B "\&.tgz" +extension if necessary instead of truncating a file with a +.B "\&.tar" +extension. +.PP +.B gunzip +can currently decompress files created by +.BR gzip , +.BR zip , +.BR compress , +.B "compress \-H" +or +.BR pack . +The detection of the input format is automatic. +When using the first two formats, +.B gunzip +checks a 32 bit CRC. +For +.B pack +and +.B gunzip +checks the uncompressed length. +The standard +.B compress +format was not designed to allow consistency checks. +However +.B gunzip +is sometimes able to detect a bad .Z file. +If you get an error when uncompressing a .Z file, +do not assume that the .Z file is +correct simply because the standard +.B uncompress +does not complain. +This generally means that the standard +.B uncompress +does not check its input, and happily generates garbage output. +The SCO compress \-H format (lzh compression method) does not include a CRC +but also allows some consistency checks. +.PP +Files created by +.B zip +can be uncompressed by gzip only if they have a single member compressed +with the 'deflation' method. +This feature is only intended to help +conversion of tar.zip files to the tar.gz format. +To extract a +.B zip +file with a single member, use a command like +.RB ' "gunzip <foo.zip" ' +or +.RB ' "gunzip \-S .zip foo.zip" '. +To extract zip files +with several members, use +.B unzip +instead of +.BR gunzip . +.PP +The +.B zcat +command +is identical to +.B gunzip +.BR \-c . +(On some systems, +.B zcat +may be installed as +.B gzcat +to preserve the original link to +.BR compress .) +.B zcat +uncompresses either a list of files on the command line or its +standard input and writes the uncompressed data on standard output. +.B zcat +will uncompress files that have the correct magic number whether +they have a +.B "\&.gz" +suffix or not. +.PP +The +.B gzip +command +uses the Lempel-Ziv algorithm used in +.B zip +and PKZIP. +The amount of compression obtained depends on the size of the +input and the distribution of common substrings. +Typically, text such as source code or English +is reduced by 60\(en70%. +Compression is generally much better than that achieved by +LZW (as used in +.BR compress ), +Huffman coding (as used in +.BR pack ), +or adaptive Huffman coding +.RB ( compact ). +.PP +Compression is always performed, even if the compressed file is +slightly larger than the original. +The worst case expansion is +a few bytes for the gzip file header, plus 5 bytes per 32\ KiB block, +or an expansion ratio of 0.015% for large files. +The actual number of used disk blocks almost never increases. +.PP +.B gzip +normally preserves the mode and modification timestamp +of a file when compressing or decompressing. +If you have appropriate privileges, +it also preserves the file's owner and group. +.SH OPTIONS +.TP +.B \-a \-\-ascii +Ascii text mode: convert end-of-lines using local conventions. +This option is supported only on some non-Unix systems. +For MSDOS, CR LF is converted to LF when compressing, +and LF is converted to CR LF when decompressing. +.TP +.B \-c \-\-stdout \-\-to-stdout +Write output on standard output; keep original files unchanged. +If there are several input files, the output consists of a sequence of +independently compressed members. +To obtain better compression, +concatenate all input files before compressing them. +.TP +.B \-d \-\-decompress \-\-uncompress +Decompress. +.TP +.B \-f \-\-force +Force compression or decompression even if the file has multiple links +or the corresponding file already exists, or if the compressed data +is read from or written to a terminal. +If the input data is not in a format recognized by +.BR gzip , +and if the option \-\-stdout is also given, copy the input data without change +to the standard output: let +.B zcat +behave as +.BR cat . +If +.B \-f +is not given, +and when not running in the background, +.B gzip +prompts to verify whether an existing file should be overwritten. +.TP +.B \-h \-\-help +Display a help screen and quit. +.TP +.B \-k \-\-keep +Keep (don't delete) input files during compression or decompression. +.TP +.B \-l \-\-list +For each compressed file, list the following fields: + + compressed size: size of the compressed file + uncompressed size: size of the uncompressed file + ratio: compression ratio (0.0% if unknown) + uncompressed_name: name of the uncompressed file + +The uncompressed size is given as \-1 for files not in gzip format, +such as compressed .Z files. +To get the uncompressed size for such a file, you can use: + + zcat file.Z | wc \-c + +In combination with the \-\-verbose option, the following fields are also +displayed: + + method: compression method + crc: the 32-bit CRC of the uncompressed data + date & time: timestamp for the uncompressed file + +The compression methods currently supported are deflate, compress, lzh +(SCO compress \-H) and pack. +The crc is given as ffffffff for a file not in gzip format. + +With \-\-name, the uncompressed name, date and time are +those stored within the compress file if present. + +With \-\-verbose, the size totals and compression ratio for all files +is also displayed, unless some sizes are unknown. +With \-\-quiet, the title and totals lines are not displayed. +.TP +.B \-L \-\-license +Display the +.B gzip +license and quit. +.TP +.B \-n \-\-no-name +When compressing, do not save the original file name and timestamp by default. +(The original name is always saved if the name had to be truncated.) +When decompressing, do not restore the original file name +if present (remove only the +.B gzip +suffix from the compressed file name) and do not restore the original +timestamp if present (copy it from the compressed file). +This option is the default when decompressing. +.TP +.B \-N \-\-name +When compressing, always save the original file name, and save +the seconds part of the original modification timestamp if the +original is a regular file and its timestamp is at least 1 (1970-01-01 +00:00:01 UTC) and is less than 2**32 (2106-02-07 06:28:16 UTC, +assuming leap seconds are not counted); this +is the default. +When decompressing, restore from the saved file name and +timestamp if present. +This option is useful on systems which have a limit on file name +length or when the timestamp has been lost after a file transfer. +.TP +.B \-q \-\-quiet +Suppress all warnings. +.TP +.B \-r \-\-recursive +Travel the directory structure recursively. +If any of the file names specified on the command line are directories, +.B gzip +will descend into the directory and compress all the files it finds there +(or decompress them in the case of +.B gunzip +). +.TP +.B \-S .suf \-\-suffix .suf +When compressing, use suffix .suf instead of .gz. +Any non-empty suffix can be given, but suffixes +other than .z and .gz should be avoided to avoid confusion when files +are transferred to other systems. + +When decompressing, add .suf to the beginning of the list of +suffixes to try, when deriving an output file name from an input file name. +.TP +.B \-\-synchronous +Use synchronous output. +With this option, +.B gzip +is less likely to lose data during a system crash, but it can be +considerably slower. +.TP +.B \-t \-\-test +Test. +Check the compressed file integrity then quit. +.TP +.B \-v \-\-verbose +Verbose. +Display the name and percentage reduction for each file compressed +or decompressed. +.TP +.B \-V \-\-version +Version. +Display the version number and compilation options then quit. +.TP +.B \-# \-\-fast \-\-best +Regulate the speed of compression using the specified digit +.BR # , +where +.B \-1 +or +.B \-\-fast +indicates the fastest compression method (less compression) +and +.B \-9 +or +.B \-\-best +indicates the slowest compression method (best compression). +The default compression level is +.B \-6 +(that is, biased towards high compression at expense of speed). +.TP +.B \-\-rsyncable +When you synchronize a compressed file between two computers, +this option allows rsync to transfer only files that were changed in +the archive instead of the entire archive. +Normally, after a change is made to any file in the archive, +the compression algorithm can generate a new version of the archive +that does not match the previous version of the archive. +In this case, rsync transfers the entire new version of the archive to +the remote computer. +With this option, rsync can transfer only the changed files as well as +a small amount of metadata that is required to update the archive +structure in the area that was changed. +.SH "ADVANCED USAGE" +Multiple compressed files can be concatenated. +In this case, +.B gunzip +will extract all members at once. +For example: + + gzip \-c file1 > foo.gz + gzip \-c file2 >> foo.gz + +Then + + gunzip \-c foo + +is equivalent to + + cat file1 file2 + +In case of damage to one member of a .gz file, other members can +still be recovered (if the damaged member is removed). +However, you can get better compression by compressing all members at once: + + cat file1 file2 | gzip > foo.gz + +compresses better than + + gzip \-c file1 file2 > foo.gz + +If you want to recompress concatenated files to get better compression, do: + + gzip \-cd old.gz | gzip > new.gz + +If a compressed file consists of several members, the uncompressed +size and CRC reported by the \-\-list option applies to the last member only. +If you need the uncompressed size for all members, you can use: + + gzip \-cd file.gz | wc \-c + +If you wish to create a single archive file with multiple members so +that members can later be extracted independently, use an archiver +such as tar or zip. +GNU tar supports the \-z option to invoke gzip transparently. +gzip is designed as a complement to tar, not as a replacement. +.SH "ENVIRONMENT" +The obsolescent environment variable +.B GZIP +can hold a set of default options for +.BR gzip . +These options are interpreted first and can be overwritten by explicit +command line parameters. +As this can cause problems when using scripts, +this feature is supported only for options that are +reasonably likely to not cause too much harm, and +.B gzip +warns if it is used. +This feature will be removed in a future release of +.BR gzip . +.PP +You can use an alias or script instead. +For example, if +.B gzip +is in the directory +.B /usr/bin +you can prepend +.B $HOME/bin +to your +.B PATH +and create an executable script +.B $HOME/bin/gzip +containing the following: + + #! /bin/sh + export PATH=/usr/bin + exec gzip \-9 "$@" +.SH "SEE ALSO" +.BR znew (1), +.BR zcmp (1), +.BR zmore (1), +.BR zforce (1), +.BR gzexe (1), +.BR zip (1), +.BR unzip (1), +.BR compress (1) +.PP +The +.B gzip +file format is specified in P. Deutsch, \s-1GZIP\s0 file format +specification version 4.3, +.BR <https://www.ietf.org/rfc/rfc1952.txt> , +Internet RFC 1952 (May 1996). +The +.B zip +deflation format is specified in P. Deutsch, \s-1DEFLATE\s0 Compressed +Data Format Specification version 1.3, +.BR <https://www.ietf.org/rfc/rfc1951.txt> , +Internet RFC 1951 (May 1996). +.SH "DIAGNOSTICS" +Exit status is normally 0; +if an error occurs, exit status is 1. +If a warning occurs, exit status is 2. +.TP +Usage: gzip [\-cdfhklLnNrtvV19] [\-S suffix] [file ...] +Invalid options were specified on the command line. +.TP +\fIfile\fP\^: not in gzip format +The file specified to +.B gunzip +has not been compressed. +.TP +\fIfile\fP\^: Corrupt input. +Use zcat to recover some data. +The compressed file has been damaged. +The data up to the point of failure can be recovered using + + zcat \fIfile\fP > recover +.TP +\fIfile\fP\^: compressed with \fIxx\fP bits, can only handle \fIyy\fP bits +.B File +was compressed (using LZW) by a program that could deal with +more +bits +than the decompress code on this machine. +Recompress the file with gzip, which compresses better and uses +less memory. +.TP +\fIfile\fP\^: already has .gz suffix \-\- unchanged +The file is assumed to be already compressed. +Rename the file and try again. +.TP +\fIfile\fP already exists; do you wish to overwrite (y or n)? +Respond "y" if you want the output file to be replaced; "n" if not. +.TP +gunzip: corrupt input +A SIGSEGV violation was detected which usually means that the input file has +been corrupted. +.TP +\fIxx.x%\fP Percentage of the input saved by compression. +(Relevant only for +.B \-v +and +.BR \-l \.) +.TP +\-\- not a regular file or directory: ignored +When the input file is not a regular file or directory, +(e.g., a symbolic link, socket, FIFO, device file), it is +left unaltered. +.TP +\-\- has \fIxx\fP other links: unchanged +The input file has links; it is left unchanged. +See +.BR ln "(1)" +for more information. +Use the +.B \-f +flag to force compression of multiply-linked files. +.SH CAVEATS +When writing compressed data to a tape, it is generally necessary to +pad the output with zeroes up to a block boundary. +When the data is read and the whole block is passed to +.B gunzip +for decompression, +.B gunzip +detects that there is extra trailing garbage after the compressed data +and emits a warning by default. +You can use the \-\-quiet option to suppress the warning. +.SH BUGS +In some rare cases, the \-\-best option gives worse compression than +the default compression level (\-6). +On some highly redundant files, +.B compress +compresses better than +.BR gzip . +.SH "REPORTING BUGS" +Report bugs to: bug\-gzip@gnu.org +.br +GNU gzip home page: <https://www.gnu.org/software/gzip/> +.br +General help using GNU software: <https://www.gnu.org/gethelp/> +.SH "COPYRIGHT NOTICE" +Copyright \(co 1998\(en1999, 2001\(en2002, 2012, 2015\(en2023 +Free Software Foundation, Inc. +.br +Copyright \(co 1992, 1993 Jean-loup Gailly +.PP +Permission is granted to make and distribute verbatim copies of +this manual provided the copyright notice and this permission notice +are preserved on all copies. +.ig +Permission is granted to process this file through troff and print the +results, provided the printed document carries copying permission +notice identical to this one except for the removal of this paragraph +(this paragraph not being relevant to the printed manual). +.. +.PP +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided that the entire +resulting derived work is distributed under the terms of a permission +notice identical to this one. +.PP +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions, +except that this permission notice may be stated in a translation approved +by the Foundation. |