X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gzip.doc;h=5fc3452e9be9977c9d702c8bdcb710712e20d7ba;hb=ad96056bdcf62abd585cdb53768fbabdde75d1b5;hp=91dbb6dcbcd116112e5ee30d96d277e9f86838f7;hpb=302189d124ed5849c2589ea92e912eb24fdc4ab3;p=debian%2Fgzip diff --git a/gzip.doc b/gzip.doc index 91dbb6d..5fc3452 100644 --- a/gzip.doc +++ b/gzip.doc @@ -73,8 +73,10 @@ User Commands GZIP(1) Files created by 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 zip files - with several members, use unzip instead of gunzip. + tar.zip files to the tar.gz format. To extract a zip file + with a single member, use a command like gunzip , Internet RFC 1952 (May 1996). The zip + deflation format is specified in P. Deutsch, DEFLATE Com- + pressed Data Format Specification version 1.3, + , Internet RFC 1951 + (May 1996). + +SunOS 5.8 Last change: local 2 + +User Commands GZIP(1) + OPTIONS -a --ascii Ascii text mode: convert end-of-lines using local con- @@ -109,11 +123,6 @@ OPTIONS pressing. -c --stdout --to-stdout - -SunOS 5.8 Last change: local 2 - -User Commands GZIP(1) - Write output on standard output; keep original files unchanged. If there are several input files, the out- put consists of a sequence of independently compressed @@ -157,6 +166,11 @@ User Commands GZIP(1) method: compression method crc: the 32-bit CRC of the uncompressed data + +SunOS 5.8 Last change: local 3 + +User Commands GZIP(1) + date & time: time stamp for the uncompressed file The compression methods currently supported are @@ -166,10 +180,6 @@ User Commands GZIP(1) With --name, the uncompressed name, date and time are those stored within the compress file if present. -SunOS 5.8 Last change: local 3 - -User Commands GZIP(1) - 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 @@ -214,6 +224,10 @@ User Commands GZIP(1) decompression on all given files regardless of suffix, as in: +SunOS 5.8 Last change: local 4 + +User Commands GZIP(1) + gunzip -S "" * (*.* for MSDOS) Previous versions of gzip used the .z suffix. This was @@ -222,10 +236,6 @@ User Commands GZIP(1) -t --test Test. Check the compressed file integrity. -SunOS 5.8 Last change: local 4 - -User Commands GZIP(1) - -v --verbose Verbose. Display the name and percentage reduction for each file compressed or decompressed. @@ -271,6 +281,10 @@ ADVANCED USAGE If you want to recompress concatenated files to get better compression, do: +SunOS 5.8 Last change: local 5 + +User Commands GZIP(1) + gzip -cd old.gz | gzip > new.gz If a compressed file consists of several members, the uncom- @@ -278,10 +292,6 @@ ADVANCED USAGE to the last member only. If you need the uncompressed size for all members, you can use: -SunOS 5.8 Last change: local 5 - -User Commands GZIP(1) - gzip -cd file.gz | wc -c If you wish to create a single archive file with multiple @@ -327,6 +337,11 @@ DIAGNOSTICS file: Corrupt input. Use zcat to recover some data. The compressed file has been damaged. The data up to + +SunOS 5.8 Last change: local 6 + +User Commands GZIP(1) + the point of failure can be recovered using zcat file > recover @@ -334,11 +349,6 @@ DIAGNOSTICS file: compressed with xx bits, can only handle yy bits File was compressed (using LZW) by a program that could deal with more bits than the decompress code on this - -SunOS 5.8 Last change: local 6 - -User Commands GZIP(1) - machine. Recompress the file with gzip, which com- presses better and uses less memory. @@ -385,17 +395,16 @@ CAVEATS data on tapes. (This example assumes you are using the GNU version of tar.) +SunOS 5.8 Last change: local 7 + +User Commands GZIP(1) + BUGS The gzip format represents the the input size modulo 2^32, so the --list option reports incorrect uncompressed sizes and compression ratios for uncompressed files 4 GB and larger. To work around this problem, you can use the fol- lowing command to discover a large uncompressed file's true - -SunOS 5.8 Last change: local 7 - -User Commands GZIP(1) - size: zcat file.gz | wc -c @@ -408,8 +417,8 @@ User Commands GZIP(1) redundant files, compress compresses better than gzip. COPYRIGHT NOTICE - Copyright (C) 1998, 1999, 2001 Free Software Foundation, - Inc. + Copyright (C) 1998, 1999, 2001, 2002 Free Software Founda- + tion, Inc. Copyright (C) 1992, 1993 Jean-loup Gailly Permission is granted to make and distribute verbatim copies