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)

  1.0.2                                     07/02/2013                                    PIXZ(1)