pixz man page on DragonFly
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PIXZ(1) PIXZ(1)
NAME
pixz - parallel, indexed xz compressor
SYNOPSIS
pixz [OPTIONS] [INPUT [OUTPUT]]
DESCRIPTION
pixz compresses and decompresses files using multiple processors. If
the input looks like a tar(1) archive, it also creates an index of all
the files in the archive. This allows the extraction of only a small
segment of the tarball, without needing to decompress the entire
archive.
OPTIONS
By default, pixz uses standard input and output, unless INPUT and
OUTPUT arguments are provided. If pixz is provided with input but no
output, it will delete the input once it’s done.
-d
Decompress, instead of compress.
-t
Force non-tarball mode. By default, pixz auto-detects tar data, and
if found enters tarball mode. When compressing in non-tarball mode,
no archive index will be created. When decompressing, fast
extraction will not be available.
-l
List the archive contents. In tarball mode, lists the files in the
tarball. In non-tarball mode, lists the blocks of compressed data.
-x PATH
Extract certain members from an archive, quickly. All members whose
path begins with PATH will be extracted.
-i INPUT
Use INPUT as the input.
-o OUTPUT
Use OUTPUT as the output.
-#
Set compression level, from -0 (lowest compression, fastest) to -9
(highest compression, slowest).
-e
Use "extreme" compression, which is much slower and only yields a
marginal decrease in size.
-p CPUS
Set the number of CPU cores to use. By default pixz will use the
number of cores on the system.
-f FRACTION
Set the size of each compression block, relative to the LZMA
dictionary size (default is 2.0). Higher values give better
compression ratios, but use more memory and make random access less
efficient. Values less than 1.0 aren’t very efficient.
-q SIZE
Set the number of blocks to allocate for the compression queue
(default is 1.3 * cores + 2, rounded up). Higher values give better
throughput, up to a point, but use more memory. Values less than
the number of cores will make some cores sit idle.
-h
Show pixz’s online help.
EXAMPLES
pixz < myfile > myfile.xz
Compress a file with pixz.
pixz myfile
Compress to myfile.pxz, removing the original.
tar -Ipixz -cf output.tpxz directory
Make tar use pixz for compression.
pixz -x path/to/file < input.tpxz | tar x
Extract one file from an archive, quickly.
AUTHOR
pixz is written by Dave Vasilevsky.
RESOURCES
The pixz homepage: http://github.com/vasi/pixz/
Source downloads: http://sourceforge.net/projects/pixz/files/
COPYRIGHT
Copyright © 2009-2010 Dave Vasilevsky. Use of this software is granted
under the FreeBSD License.
SEE ALSO
xz(1), tar(1)
06/06/2013 PIXZ(1)
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