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'\" te
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.TH pixz 1
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.SH NAME
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pixz \- parallel, indexing version of XZ
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.SH SYNOPSIS
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.LP
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.nf
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\fB/usr/bin/pixz\fR input output.pxz
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.fi
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.LP
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.nf
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\fB/usr/bin/pixz\fR -d input.pxz output
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.fi
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.LP
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.nf
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\fB/usr/bin/pixz\fR -l input.tpxz
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.fi
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.LP
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.nf
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\fB/usr/bin/pixz\fR -x /path/to/file < input.tpxz
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.fi
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.SH DESCRIPTION
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.sp
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.LP
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The existing XZ Utils ( http://tukaani.org/xz/ ) provide great compression
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in the .xz file format, but they have two significant problems:
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.sp
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.LP
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.RS +4
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.TP
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.ie t \(bu
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.el o
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They are single-threaded, while most users nowadays have multi-core computers.
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.RE
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.RS +4
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.TP
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.ie t \(bu
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.el o
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The .xz files they produce are just one big block of compressed data, rather than a collection of smaller blocks. This makes random access to the original data impossible.
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.RE
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.sp
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.LP
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With pixz, both these problems are solved.
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.SH EXAMPLES
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.sp
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.LP
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Specifying input and output:
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.sp
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.ne 2
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.mk
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.na
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$ pixz < foo.tar > foo.tpxz
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.LP
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.sp .6
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.RS 4n
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Same as 'pixz foo.tar foo.tpxz'
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.RE
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.sp
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.ne 2
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.mk
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.na
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$ pixz -i foo.tar -o foo.tpxz
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.LP
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.sp .6
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.RS 4n
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Ditto. These both work for -x, -d and -l too, eg:
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.RE
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.sp
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.ne 2
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.mk
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.na
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$ pixz -x -i foo.tpxz -o foo.tar file1 file2 ...
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.LP
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.sp .6
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.RS 4n
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# Extract the files from foo.tpxz into foo.tar
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.RE
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.sp
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.ne 2
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.mk
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.na
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$ pixz foo.tar
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.LP
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.sp .6
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.RS 4n
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Compress it to foo.tpxz, removing the original
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.RE
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.sp
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.ne 2
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.mk
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.na
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$ pixz -d foo.tpxz
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.LP
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.sp .6
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.RS 4n
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Extract it to foo.tar, removing the original
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.RE
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.SH OPTIONS
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.TP
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.B -1
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Faster, worse compression.
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.TP
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.B -9
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Better, slower compression.
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.TP
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.B -p <number>
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Cap the number of threads at <number>.
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.TP
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.B -t
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Compress but don't treat it as a tarball (don't index it).
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.TP
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.B -d
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Decompress, don't check that contents match index.
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.TP
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.B -l
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List the xz blocks instead of files.
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.SH WARNING
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Running pixz without the -t flag will cause it to treat the input
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as a tarball, as long as it looks vaguely tarball-like. This means if the
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file starts with at least 1024 zero bytes, pixz will assume it's empty, and
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truncate the output! If your input files aren't tarballs, run with -t or
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face possible data-loss.
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