pixz(1) - f29

1PIXZ(1)                                                                PIXZ(1)
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NAME

6       pixz - parallel, indexed xz compressor
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SYNOPSIS

9       pixz [OPTIONS] [INPUT [OUTPUT]]
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DESCRIPTION

12       pixz compresses and decompresses files using multiple processors. If
13       the input looks like a tar(1) archive, it also creates an index of all
14       the files in the archive. This allows the extraction of only a small
15       segment of the tarball, without needing to decompress the entire
16       archive.
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OPTIONS

19       By default, pixz uses standard input and output, unless INPUT and
20       OUTPUT arguments are provided. If pixz is provided with input but no
21       output, it will delete the input once it’s done.
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23       -d
24           Decompress, instead of compress.
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26       -t
27           Force non-tarball mode. By default, pixz auto-detects tar data, and
28           if found enters tarball mode. When compressing in non-tarball mode,
29           no archive index will be created. When decompressing, fast
30           extraction will not be available.
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32       -l
33           List the archive contents. In tarball mode, lists the files in the
34           tarball. In non-tarball mode, lists the blocks of compressed data.
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36       -x PATH
37           Extract certain members from an archive, quickly. All members whose
38           path begins with PATH will be extracted.
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40       -i INPUT
41           Use INPUT as the input.
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43       -o OUTPUT
44           Use OUTPUT as the output.
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46       -#
47           Set compression level, from -0 (lowest compression, fastest) to -9
48           (highest compression, slowest).
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50       -e
51           Use "extreme" compression, which is much slower and only yields a
52           marginal decrease in size.
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54       -p CPUS
55           Set the number of CPU cores to use. By default pixz will use the
56           number of cores on the system.
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58       -f FRACTION
59           Set the size of each compression block, relative to the LZMA
60           dictionary size (default is 2.0). Higher values give better
61           compression ratios, but use more memory and make random access less
62           efficient. Values less than 1.0 aren’t very efficient.
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64       -q SIZE
65           Set the number of blocks to allocate for the compression queue
66           (default is 1.3 * cores + 2, rounded up). Higher values give better
67           throughput, up to a point, but use more memory. Values less than
68           the number of cores will make some cores sit idle.
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70       -h
71           Show pixz’s online help.
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EXAMPLES

74       pixz < myfile > myfile.xz
75           Compress a file with pixz.
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77       pixz myfile
78           Compress to myfile.pxz, removing the original.
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80       tar -Ipixz -cf output.tpxz directory
81           Make tar use pixz for compression.
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83       pixz -x path/to/file < input.tpxz | tar x
84           Extract one file from an archive, quickly.
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AUTHOR

87       pixz is written by Dave Vasilevsky.
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RESOURCES

90       The pixz homepage: http://github.com/vasi/pixz/
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92       Source downloads: https://github.com/vasi/pixz/releases/
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COPYRIGHT

95       Copyright © 2009-2010 Dave Vasilevsky. Use of this software is granted
96       under the FreeBSD License.
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