Tribblix: manual page: lzip.1

LZIP(1) User Commands LZIP(1)

NAME

lzip - reduces the size of files

SYNOPSIS

lzip [options] [files]

DESCRIPTION

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.

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, --member-size=<bytes>
set member size limit in bytes

-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]

-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]

-S, --volume-size=<bytes>
set volume size limit in bytes

-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

If no file names are given, or if a file is '-', lzip 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 'lzip -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 lzip to panic.

The ideas embodied in lzip are due to (at least) the following
people: Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey
Markov (for the definition of Markov chains), G.N.N. Martin (for the
definition of range encoding), Igor Pavlov (for putting all the above
together in LZMA), and Julian Seward (for bzip2's CLI).

REPORTING BUGS

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

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