Provided by:
xz-utils_4.999.8beta-0ubuntu2_i386 
NAME
xz, unxz, xzcat, lzma, unlzma, lzcat - tightly compress or expand files
SYNOPSIS
xz [ OPTION ]... [ FILE ]...
unxz [ OPTION ]... [ FILE ]...
xzcat [ OPTION ]... [ FILE ]...
lzma [ OPTION ]... [ FILE ]...
unlzma [ OPTION ]... [ FILE ]...
lzcat [ OPTION ]... [ FILE ]...
DESCRIPTION
Compresses or decompress named files in the .xz format.
Mandatory arguments to long options are mandatory for short options
too.
Operation mode:
-z, --compress
force compression
-d, --decompress
force decompression
-t, --test
test compressed file integrity
-l, --list
list information about files
Operation modifiers:
-k, --keep
keep (don’t delete) input files
-f, --force
force overwrite of output file and (de)compress links
-c, --stdout
write to standard output and don’t delete input files
-S, --suffix=.SUF
use the suffix ‘.SUF’ on compressed files
--files=[FILE]
read filenames to process from FILE; if FILE is omitted,
filenames are read from the standard input; filenames must be
terminated with the newline character
--files0=[FILE] like --files but use the null character as terminator
Basic file format and compression options:
-F, --format=FMT
file format to encode or decode; possible values are ‘auto’
(default), ‘xz’, ‘lzma’, and ‘raw’
-C, --check=CHECK
integrity check type: ‘crc32’, ‘crc64’ (default), or ‘sha256’
-0 .. -9
compression preset; 0-2 fast compression, 3-5 good compression,
6-9 excellent compression; default is 6
-e, --extreme
use more CPU time when encoding to increase compression ratio
without increasing memory usage of the decoder
-M, --memory=NUM
use roughly NUM bytes of memory at maximum; 0 indicates the
default setting, which depends on the operation mode and the
amount of physical memory (RAM)
Custom filter chain for compression (alternative for using
presets):
--lzma1=[OPTS]
LZMA1 or LZMA2; OPTS is a comma-separated list of zero or
--lzma2=[OPTS]
more of the following options (valid values; default):
preset=NUM reset options to preset number NUM (1-9) dict=NUM
dictionary size (4KiB - 1536MiB; 8MiB) lc=NUM number of
literal context bits (0-4; 3) lp=NUM number of literal
position bits (0-4; 0) pb=NUM number of position bits (0-4;
2) mode=MODE compression mode (fast, normal; normal) nice=NUM
nice length of a match (2-273; 64) mf=NAME match finder (hc3,
hc4, bt2, bt3, bt4; bt4) depth=NUM maximum search depth;
0=automatic (default)
--x86 x86 filter (sometimes called BCJ filter)
--powerpc
PowerPC (big endian) filter
--ia64 IA64 (Itanium) filter
--arm ARM filter
--armthumb
ARM-Thumb filter
--sparc
SPARC filter
--delta=[OPTS]
Delta filter; valid OPTS (valid values; default): dist=NUM
distance between bytes being subtracted
from each other (1-256; 1)
Other options:
-q, --quiet
suppress warnings; specify twice to suppress errors too
-v, --verbose
be verbose; specify twice for even more verbose
-h, --help
display the short help (lists only the basic options)
-H, --long-help
display this long help
-V, --version
display the version number
With no FILE, or when FILE is -, reads standard input.
REPORTING BUGS
Report bugs to <lasse.collin@tukaani.org> (in English or Finnish).
liblzma 4.999.8beta