plzip(1)

reduces the size of files

Section 1 plzip bookworm source

Description

PLZIP

NAME

plzip - reduces the size of files

SYNOPSIS

plzip [options] [files]

DESCRIPTION

Plzip is a massively parallel (multi-threaded) implementation of lzip, fully compatible with lzip 1.4 or newer. Plzip uses the compression library lzlib.

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 and provides a 3 factor integrity checking to maximize interoperability and optimize safety. Lzip can compress about as fast as gzip (lzip -0) or compress most files more than bzip2 (lzip -9). 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.

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.

OPTIONS

-h, --help

display this help and exit

-V, --version

output version information and exit

-a, --trailing-error

exit with error status if trailing data

-B, --data-size=<bytes>

set size of input data blocks [2x8=16 MiB]

-c, --stdout

write to standard output, keep input files

-d, --decompress

decompress

-f, --force

overwrite existing output files

-F, --recompress

force re-compression of compressed files

-k, --keep

keep (don’t delete) input files

-l, --list

print (un)compressed file sizes

-m, --match-length=<bytes>

set match length limit in bytes [36]

-n, --threads=<n>

set number of (de)compression threads [2]

-o, --output=<file>

write to <file>, keep input files

-q, --quiet

suppress all messages

-s, --dictionary-size=<bytes>

set dictionary size limit in bytes [8 MiB]

-t, --test

test compressed file integrity

-v, --verbose

be verbose (a 2nd -v gives more)

-0 .. -9

set compression level [default 6]

--fast

alias for -0

--best

alias for -9

--loose-trailing

allow trailing data seeming corrupt header

--in-slots=<n>

number of 1 MiB input packets buffered [4]

--out-slots=<n>

number of 1 MiB output packets buffered [64]

--check-lib

compare version of lzlib.h with liblz.{a,so}

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 = 10ˆ3 = 1000, Ki = KiB = 2ˆ10 = 1024, M = 10ˆ6, Mi = 2ˆ20, G = 10ˆ9, Gi = 2ˆ30, etc... Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2ˆ12 to 2ˆ29 bytes.

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 --dictionary-size and --match-length directly to achieve optimal performance.

To extract all the files from archive ’foo.tar.lz’, use the commands ’tar -xf foo.tar.lz’ or ’plzip -cd foo.tar.lz | tar -xf -’.

Exit status: 0 for a normal exit, 1 for environmental problems (file not found, invalid flags, 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.

REPORTING BUGS

Report bugs to lzip-bug@nongnu.org
Plzip home page: http://www.nongnu.org/lzip/plzip.html

COPYRIGHT

Copyright © 2009 Laszlo Ersek.
Copyright © 2022 Antonio Diaz Diaz. Using lzlib 1.13 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.