PLZIP(1) User Commands PLZIP(1)
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 li-
brary 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 'Lem-
pel-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 intermedi-
ate 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-pur-
pose 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 = 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.
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.
SEE ALSO
The full documentation for plzip is maintained as a Texinfo manual. If
the info and plzip programs are properly installed at your site, the
command
info plzip
should give you access to the complete manual.
plzip 1.10 January 2022 PLZIP(1)
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