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| <tr><td width=20><td><b>GZIP(1)</b><td align=right><b>GZIP(1)</b> |
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| <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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| </table> |
| <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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| </table> |
| <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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| </table> |
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