108 lines
4.3 KiB
Groff
108 lines
4.3 KiB
Groff
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.49.2.
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.TH LUNZIP "1" "January 2025" "lunzip 1.15" "User Commands"
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.SH NAME
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lunzip \- decompressor for the lzip format
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.SH SYNOPSIS
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.B lunzip
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[\fI\,options\/\fR] [\fI\,files\/\fR]
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.SH DESCRIPTION
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Lunzip is a decompressor for the lzip format written in C. Its small size
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makes it well suited for embedded devices or software installers that need
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to decompress files but don't need compression capabilities.
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.PP
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Lzip is a lossless data compressor with a user interface similar to the one
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of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel\-Ziv\-Markov
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chain\-Algorithm) designed to achieve complete interoperability between
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implementations. The maximum dictionary size is 512 MiB so that any lzip
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file can be decompressed on 32\-bit machines. Lzip provides accurate and
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robust 3\-factor integrity checking. 'lzip \fB\-0\fR' compresses about as fast as
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gzip, while 'lzip \fB\-9\fR' compresses most files more than bzip2. Decompression
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speed is intermediate between gzip and bzip2. Lzip provides better data
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recovery capabilities than gzip and bzip2. Lzip has been designed, written,
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and tested with great care to replace gzip and bzip2 as general\-purpose
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compressed format for Unix\-like systems.
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.PP
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Lunzip provides a 'low memory' mode able to decompress any file using as
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little memory as 50 kB, irrespective of the dictionary size used to
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compress the file. To activate it, specify the size of the output buffer
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with the option \fB\-\-buffer\-size\fR and lunzip will use the decompressed
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file as dictionary for distances beyond the buffer size. Of course, the
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larger the difference between the buffer size and the dictionary size, the
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more accesses to disc are needed and the slower the decompression is.
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This 'low memory' mode only works when decompressing to a regular file
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and is intended for systems without enough memory (RAM + swap) to keep
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the whole dictionary at once.
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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display this help and exit
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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output version information and exit
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.TP
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\fB\-a\fR, \fB\-\-trailing\-error\fR
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exit with error status if trailing data
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.TP
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\fB\-c\fR, \fB\-\-stdout\fR
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write to standard output, keep input files
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.TP
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\fB\-d\fR, \fB\-\-decompress\fR
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decompress (this is the default)
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.TP
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\fB\-f\fR, \fB\-\-force\fR
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overwrite existing output files
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.TP
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\fB\-k\fR, \fB\-\-keep\fR
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keep (don't delete) input files
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.TP
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\fB\-l\fR, \fB\-\-list\fR
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print (un)compressed file sizes
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.TP
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\fB\-o\fR, \fB\-\-output=\fR<file>
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write to <file>, keep input files
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.TP
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\fB\-q\fR, \fB\-\-quiet\fR
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suppress all messages
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.TP
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\fB\-t\fR, \fB\-\-test\fR
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test compressed file integrity
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.TP
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\fB\-u\fR, \fB\-\-buffer\-size=\fR<bytes>
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set output buffer size in bytes
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.TP
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\fB\-v\fR, \fB\-\-verbose\fR
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be verbose (a 2nd \fB\-v\fR gives more)
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.TP
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\fB\-\-loose\-trailing\fR
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allow trailing data seeming corrupt header
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.PP
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If no file names are given, or if a file is '\-', lunzip decompresses
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from standard input to standard output.
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Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,
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Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...
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Buffer sizes 12 to 29 are interpreted as powers of two, meaning 2^12 to
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2^29 bytes.
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.PP
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To extract all the files from archive 'foo.tar.lz', use the commands
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\&'tar \fB\-xf\fR foo.tar.lz' or 'lunzip \fB\-cd\fR foo.tar.lz | tar \fB\-xf\fR \-'.
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.PP
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Exit status: 0 for a normal exit, 1 for environmental problems
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(file not found, invalid command\-line options, I/O errors, etc), 2 to
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indicate a corrupt or invalid input file, 3 for an internal consistency
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error (e.g., bug) which caused lunzip to panic.
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.PP
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The ideas embodied in lunzip are due to (at least) the following people:
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Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the
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definition of Markov chains), G.N.N. Martin (for the definition of range
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encoding), Igor Pavlov (for putting all the above together in LZMA), and
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Julian Seward (for bzip2's CLI).
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.SH "REPORTING BUGS"
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Report bugs to lzip\-bug@nongnu.org
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.br
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Lunzip home page: http://www.nongnu.org/lzip/lunzip.html
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.SH COPYRIGHT
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Copyright \(co 2025 Antonio Diaz Diaz.
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License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
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.br
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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