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<title>gzip(1) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>GZIP(1)</b><td align=right><b>GZIP(1)</b>
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<br>
<p><font size=+1><b>NAME </b></font><br>
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gzip, gunzip, bzip2, bunzip2, zip, unzip, – compress and expand
data<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>gzip</font></tt> [<tt><font size=+1>−cvD</font></tt>[<tt><font size=+1>1−9</font></tt>]] [<i>file</i> <tt><font size=+1>...</font></tt>]
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<tt><font size=+1>gunzip</font></tt> [<tt><font size=+1>−ctTvD</font></tt>] [<i>file</i> <tt><font size=+1>...</font></tt>]
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<tt><font size=+1>bzip2</font></tt> [<tt><font size=+1>−cvD</font></tt>[<tt><font size=+1>1−9</font></tt>]] [<i>file</i> <tt><font size=+1>...</font></tt>]
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<tt><font size=+1>bunzip2</font></tt> [<tt><font size=+1>−cvD</font></tt>] [<i>file</i> <tt><font size=+1>...</font></tt>]
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<tt><font size=+1>zip</font></tt> [<tt><font size=+1>−vD</font></tt>[<tt><font size=+1>1−9</font></tt>]] [<tt><font size=+1>−f</font></tt> <i>zipfile</i>] <i>file</i> [<tt><font size=+1>...</font></tt>]
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<tt><font size=+1>unzip</font></tt> [<tt><font size=+1>−cistTvD</font></tt>] [<tt><font size=+1>−f</font></tt> <i>zipfile</i>] <i>[</i>file <tt><font size=+1>...</font></tt>]<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Gzip</i> encodes files with a hybrid Lempel-Ziv 1977 and Huffman compression
algorithm known as <tt><font size=+1>deflate</font></tt>. Most of the time, the resulting file
is smaller, and will never be much bigger. Output files are named
by taking the last path element of each file argument and appending
<tt><font size=+1>.gz</font></tt>; if the resulting name ends with
<tt><font size=+1>.tar.gz</font></tt>, it is converted to <tt><font size=+1>.tgz</font></tt> instead. <i>Gunzip</i> reverses the
process. Its output files are named by taking the last path element
of each file argument, converting <tt><font size=+1>.tgz</font></tt> to <tt><font size=+1>.tar.gz</font></tt>, and stripping
any <tt><font size=+1>.gz</font></tt>; the resulting name must be different from the original
name.
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<i>Bzip2</i> and <i>bunzip2</i> are similar in interface to <i>gzip</i> and <i>gunzip</i>,
but use a modified Burrows-Wheeler block sorting compression algorithm.
The default suffix for output files is <tt><font size=+1>.bz2</font></tt>, with <tt><font size=+1>.tar.bz2</font></tt> becoming
<tt><font size=+1>.tbz</font></tt>. <i>Bunzip2</i> recognizes the extension <tt><font size=+1>.tbz2</font></tt> as a synonym for
<tt><font size=+1>.tbz</font></tt>.
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<i>Zip</i> encodes the named files and places the results into the archive
<i>zipfile</i>, or the standard output if no file is given. <i>Unzip</i> extracts
files from an archive created by <i>zip</i>. If no files are named as
arguments, all of files in the archive are extracted. A directory’s
name implies all recursively contained files and subdirectories.
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None of these programs removes the original files. If the process
fails, the faulty output files are removed.
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The options are:<br>
<tt><font size=+1>−c</font></tt> Write to standard output rather than creating an output file.<br>
<tt><font size=+1>−i</font></tt> Convert all archive file names to lower case.<br>
<tt><font size=+1>−s</font></tt> Streaming mode. Looks at the file data adjacent to each compressed
file rather than seeking in the central file directory. This is
the mode used by <i>unzip</i> if no <i>zipfile</i> is specified. If <tt><font size=+1>−s</font></tt> is given,
<tt><font size=+1>−T</font></tt> is ignored.<br>
<tt><font size=+1>−t</font></tt> List matching files in the archive rather than extracting them.<br>
<tt><font size=+1>−T</font></tt> Set the output time to that specified in the archive.<br>
<tt><font size=+1>−1</font></tt> .. <tt><font size=+1>−9</font></tt> Sets the compression level. <tt><font size=+1>−1</font></tt> is tuned for speed, <tt><font size=+1>−9</font></tt>
for minimal output size. The best compromise is <tt><font size=+1>−6</font></tt>, the default.<br>
<tt><font size=+1>−v</font></tt> Produce more descriptive output. With <tt><font size=+1>−t</font></tt>, adds the uncompressed
size in bytes and the modification time to the output. Without
<tt><font size=+1>−t</font></tt>, prints the names of files on standard error as they are compressed
or decompressed.<br>
<tt><font size=+1>−D</font></tt> Produce debugging output.<br>
</table>
<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/cmd/gzip<br>
/usr/local/plan9/src/cmd/bzip2<br>
</font></tt>
</table>
<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man1/tar.html"><i>tar</i>(1)</a>, <a href="../man1/compress.html"><i>compress</i>(1)</a><br>
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<p><font size=+1><b>BUGS </b></font><br>
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<i>Unzip</i> can only extract files which are uncompressed or compressed
with the <tt><font size=+1>deflate</font></tt> compression scheme. Recent zip files fall into
this category.<br>
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