X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gzip.doc;h=e8efea79bdbfb56d2199348341f5b5271eeac09c;hb=bb237929fec6af7764d532c4e5348c9990f8e87e;hp=653599f3cde7a2f5afcb230660a621a5b2270a49;hpb=d57728a6ca2413a7c564d8b7bb13d9e5a5a180f3;p=debian%2Fgzip diff --git a/gzip.doc b/gzip.doc index 653599f..e8efea7 100644 --- a/gzip.doc +++ b/gzip.doc @@ -188,6 +188,11 @@ GZIP(1) General Commands Manual GZIP(1) suffixes to try, when deriving an output file name from an input file name. + 1m--synchronous0m + Use synchronous output. With this option, 4mgzip24m is less likely + to lose data during a system crash, but it can be considerably + slower. + 1m-t --test0m Test. Check the compressed file integrity. @@ -207,6 +212,19 @@ GZIP(1) General Commands Manual GZIP(1) level is 1m-6 22m(that is, biased towards high compression at expense of speed). + 1m--rsyncable0m + 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 compres- + sion 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. + 1mADVANCED USAGE0m Multiple compressed files can be concatenated. In this case, 4mgunzip0m will extract all members at once. For example: @@ -249,15 +267,24 @@ GZIP(1) General Commands Manual GZIP(1) ently. gzip is designed as a complement to tar, not as a replacement. 1mENVIRONMENT0m - The environment variable 1mGZIP 22mcan hold a set of default options for - 4mgzip24m. These options are interpreted first and can be overwritten by - explicit command line parameters. For example: - for sh: GZIP="-8v --name"; export GZIP - for csh: setenv GZIP "-8v --name" - for MSDOS: set GZIP=-8v --name + The obsolescent environment variable 1mGZIP 22mcan hold a set of default + options for 4mgzip24m. These options are interpreted first and can be over- + written by explicit command line parameters. As this can cause prob- + lems when using scripts, this feature is supported only for options + that are reasonably likely to not cause too much harm, and 4mgzip24m warns + if it is used. This feature will be removed in a future release of + 4mgzip24m. + + You can use an alias or script instead. For example, if 4mgzip24m is in the + directory 1m/usr/bin 22myou can prepend 1m$HOME/bin 22mto your 1mPATH 22mand create an + executable script 1m$HOME/bin/gzip 22mcontaining the following: - On Vax/VMS, the name of the environment variable is GZIP_OPT, to avoid - a conflict with the symbol set for invocation of the program. + #! /bin/sh + export PATH=/usr/bin + exec gzip -9 "$@" + + On VMS, the name of the obsolescent environment variable is GZIP_OPT, + to avoid a conflict with the symbol set for invocation of the program. 1mSEE ALSO0m znew(1), zcmp(1), zmore(1), zforce(1), gzexe(1), zip(1), unzip(1), com- @@ -291,7 +318,7 @@ GZIP(1) General Commands Manual GZIP(1) press the file with gzip, which compresses better and uses less memory. - 4mfile24m: already has .gz suffix -- no change + 4mfile24m: already has .gz suffix -- unchanged The file is assumed to be already compressed. Rename the file and try again. @@ -320,16 +347,8 @@ GZIP(1) General Commands Manual GZIP(1) pad the output with zeroes up to a block boundary. When the data is read and the whole block is passed to 4mgunzip24m for decompression, 4mgunzip0m detects that there is extra trailing garbage after the compressed data - and emits a warning by default. You have to use the --quiet option to - suppress the warning. This option can be set in the 1mGZIP 22menvironment - variable as in: - for sh: GZIP="-q" tar -xfz --block-compress /dev/rst0 - for csh: (setenv GZIP -q; tar -xfz --block-compr /dev/rst0 - - In the above example, gzip is invoked implicitly by the -z option of - GNU tar. Make sure that the same block size (-b option of tar) is used - for reading and writing compressed data on tapes. (This example - assumes you are using the GNU version of tar.) + and emits a warning by default. You can use the --quiet option to sup- + press the warning. 1mBUGS0m The gzip format represents the input size modulo 2^32, so the --list @@ -348,8 +367,8 @@ GZIP(1) General Commands Manual GZIP(1) 4mpress24m compresses better than 4mgzip24m. 1mCOPYRIGHT NOTICE0m - Copyright (C) 1998, 1999, 2001, 2002, 2012 Free Software Foundation, - Inc. + Copyright (C) 1998-1999, 2001-2002, 2012, 2015-2016 Free Software Foun- + dation, Inc. Copyright (C) 1992, 1993 Jean-loup Gailly Permission is granted to make and distribute verbatim copies of this