diff options
Diffstat (limited to 'doc/plzip.1')
| -rw-r--r-- | doc/plzip.1 | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/doc/plzip.1 b/doc/plzip.1 new file mode 100644 index 0000000..3985e5b --- /dev/null +++ b/doc/plzip.1 @@ -0,0 +1,148 @@ +.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.49.2. +.TH PLZIP "1" "January 2024" "plzip 1.11" "User Commands" +.SH NAME +plzip \- reduces the size of files +.SH SYNOPSIS +.B plzip +[\fI\,options\/\fR] [\fI\,files\/\fR] +.SH DESCRIPTION +Plzip is a massively parallel (multi\-threaded) implementation of lzip, +compatible with lzip 1.4 or newer. Plzip uses the compression library lzlib. +.PP +Lzip is a lossless data compressor with a user interface similar to the one +of gzip or bzip2. Lzip uses a simplified form of the 'Lempel\-Ziv\-Markov +chain\-Algorithm' (LZMA) stream format to maximize interoperability. The +maximum dictionary size is 512 MiB so that any lzip file can be decompressed +on 32\-bit machines. Lzip provides accurate and robust 3\-factor integrity +checking. Lzip can compress about as fast as gzip (lzip \fB\-0\fR) or compress most +files more than bzip2 (lzip \fB\-9\fR). Decompression speed is intermediate between +gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery +perspective. Lzip has been designed, written, and tested with great care to +replace gzip and bzip2 as the standard general\-purpose compressed format for +Unix\-like systems. +.PP +Plzip can compress/decompress large files on multiprocessor machines much +faster than lzip, at the cost of a slightly reduced compression ratio (0.4 +to 2 percent larger compressed files). Note that the number of usable +threads is limited by file size; on files larger than a few GB plzip can use +hundreds of processors, but on files of only a few MB plzip is no faster +than lzip. +.SH OPTIONS +.TP +\fB\-h\fR, \fB\-\-help\fR +display this help and exit +.TP +\fB\-V\fR, \fB\-\-version\fR +output version information and exit +.TP +\fB\-a\fR, \fB\-\-trailing\-error\fR +exit with error status if trailing data +.TP +\fB\-B\fR, \fB\-\-data\-size=\fR<bytes> +set size of input data blocks [2x8=16 MiB] +.TP +\fB\-c\fR, \fB\-\-stdout\fR +write to standard output, keep input files +.TP +\fB\-d\fR, \fB\-\-decompress\fR +decompress, test compressed file integrity +.TP +\fB\-f\fR, \fB\-\-force\fR +overwrite existing output files +.TP +\fB\-F\fR, \fB\-\-recompress\fR +force re\-compression of compressed files +.TP +\fB\-k\fR, \fB\-\-keep\fR +keep (don't delete) input files +.TP +\fB\-l\fR, \fB\-\-list\fR +print (un)compressed file sizes +.TP +\fB\-m\fR, \fB\-\-match\-length=\fR<bytes> +set match length limit in bytes [36] +.TP +\fB\-n\fR, \fB\-\-threads=\fR<n> +set number of (de)compression threads [2] +.TP +\fB\-o\fR, \fB\-\-output=\fR<file> +write to <file>, keep input files +.TP +\fB\-q\fR, \fB\-\-quiet\fR +suppress all messages +.TP +\fB\-s\fR, \fB\-\-dictionary\-size=\fR<bytes> +set dictionary size limit in bytes [8 MiB] +.TP +\fB\-t\fR, \fB\-\-test\fR +test compressed file integrity +.TP +\fB\-v\fR, \fB\-\-verbose\fR +be verbose (a 2nd \fB\-v\fR gives more) +.TP +\fB\-0\fR .. \fB\-9\fR +set compression level [default 6] +.TP +\fB\-\-fast\fR +alias for \fB\-0\fR +.TP +\fB\-\-best\fR +alias for \fB\-9\fR +.TP +\fB\-\-loose\-trailing\fR +allow trailing data seeming corrupt header +.TP +\fB\-\-in\-slots=\fR<n> +number of 1 MiB input packets buffered [4] +.TP +\fB\-\-out\-slots=\fR<n> +number of 1 MiB output packets buffered [64] +.TP +\fB\-\-check\-lib\fR +compare version of lzlib.h with liblz.{a,so} +.PP +If no file names are given, or if a file is '\-', plzip compresses or +decompresses from standard input to standard output. +Numbers may be followed by a multiplier: k = kB = 10^3 = 1000, +Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc... +Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12 to +2^29 bytes. +.PP +The bidimensional parameter space of LZMA can't be mapped to a linear scale +optimal for all files. If your files are large, very repetitive, etc, you +may need to use the options \fB\-\-dictionary\-size\fR and \fB\-\-match\-length\fR directly +to achieve optimal performance. +.PP +To extract all the files from archive 'foo.tar.lz', use the commands +\&'tar \fB\-xf\fR foo.tar.lz' or 'plzip \fB\-cd\fR foo.tar.lz | tar \fB\-xf\fR \-'. +.PP +Exit status: 0 for a normal exit, 1 for environmental problems +(file not found, invalid command\-line options, I/O errors, etc), 2 to +indicate a corrupt or invalid input file, 3 for an internal consistency +error (e.g., bug) which caused plzip to panic. +.SH "REPORTING BUGS" +Report bugs to lzip\-bug@nongnu.org +.br +Plzip home page: http://www.nongnu.org/lzip/plzip.html +.SH COPYRIGHT +Copyright \(co 2009 Laszlo Ersek. +.br +Copyright \(co 2024 Antonio Diaz Diaz. +License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html> +.br +This is free software: you are free to change and redistribute it. +There is NO WARRANTY, to the extent permitted by law. +Using lzlib 1.14 +Using LZ_API_VERSION = 1014 +.SH "SEE ALSO" +The full documentation for +.B plzip +is maintained as a Texinfo manual. If the +.B info +and +.B plzip +programs are properly installed at your site, the command +.IP +.B info plzip +.PP +should give you access to the complete manual. |