pixz - parallel, indexed xz compressor
pixz [OPTIONS] [INPUT [OUTPUT]]
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.
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.
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.
pixz is written by Dave Vasilevsky.
The pixz homepage: http://github.com/vasi/pixz/
Source downloads: https://github.com/vasi/pixz/releases/
Copyright © 2009-2010 Dave Vasilevsky. Use of this software
is granted under the FreeBSD License.