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104 lines
4.3 KiB
HTML
104 lines
4.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>bzip2</title>
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<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" />
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<link rel="HOME" title="Slackware Linux Essentials" href="index.html" />
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<link rel="UP" title="Archive Files" href="archive-files.html" />
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<link rel="PREVIOUS" title="Archive Files" href="archive-files.html" />
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<link rel="NEXT" title="tar" href="archive-files-tar.html" />
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
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</head>
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<body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"
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alink="#0000FF">
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<div class="NAVHEADER">
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<table summary="Header navigation table" width="100%" border="0" cellpadding="0"
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cellspacing="0">
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<tr>
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<th colspan="3" align="center">Slackware Linux Essentials</th>
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</tr>
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<tr>
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<td width="10%" align="left" valign="bottom"><a href="archive-files.html"
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accesskey="P">Prev</a></td>
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<td width="80%" align="center" valign="bottom">Chapter 15 Archive Files</td>
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<td width="10%" align="right" valign="bottom"><a href="archive-files-tar.html"
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accesskey="N">Next</a></td>
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</tr>
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</table>
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<hr align="LEFT" width="100%" />
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</div>
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<div class="SECT1">
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<h1 class="SECT1"><a id="ARCHIVE-FILES-BZIP2" name="ARCHIVE-FILES-BZIP2">15.2 <tt
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class="COMMAND">bzip2</tt></a></h1>
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<p><tt class="COMMAND">bzip2</tt>(1) is an alternative compression program installed on
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Slackware Linux. It uses a different compression algorithm from <tt
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class="COMMAND">gzip</tt>, which results in some advantages and some disadvantages. The
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main advantage for <tt class="COMMAND">bzip2</tt> is the compressed file size. <tt
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class="COMMAND">bzip2</tt> will almost always compress better than <tt
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class="COMMAND">gzip</tt>. In some instances, this can result in dramatically smaller
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files. This can be a great advantage for people on slower modem connections. Also
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remember, when downloading software from a public ftp server, it's generally good
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netiquette to download the <tt class="FILENAME">.bz2</tt> files instead of the <tt
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class="FILENAME">.gz</tt> files, as this results in less overhead for the generous people
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hosting the server.</p>
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<p>The disadvantage to <tt class="COMMAND">bzip2</tt> is that it is more CPU intensive
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than <tt class="COMMAND">gzip</tt>. This means that bzipping a file will generally take
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longer and will use more of the CPU than gzipping the file would. When considering which
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compression program to use, you must weigh this speed vs. compressed size and determine
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which is more important.</p>
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<p>The usage of <tt class="COMMAND">bzip2</tt> is nearly identical to <tt
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class="COMMAND">gzip</tt>, so not much time will be spent discussing it. Like <tt
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class="COMMAND">gunzip</tt>, <tt class="COMMAND">bunzip2</tt> is identical to <tt
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class="COMMAND">bzip2 -d</tt>. The primary difference in practical usage is that <tt
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class="COMMAND">bzip2</tt> uses the <tt class="FILENAME">.bz2</tt> extension.</p>
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<table border="0" bgcolor="#E0E0E0" width="100%">
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<tr>
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<td>
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<pre class="SCREEN">
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bzip2 <var
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class="REPLACEABLE">filename</var></kbd>
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bunzip2 <var
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class="REPLACEABLE">filename.bz2</var></kbd>
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bzip2 -9 <var
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class="REPLACEABLE">filename</var></kbd>
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</pre>
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</td>
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</tr>
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</table>
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</div>
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<div class="NAVFOOTER">
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<hr align="LEFT" width="100%" />
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<table summary="Footer navigation table" width="100%" border="0" cellpadding="0"
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cellspacing="0">
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<tr>
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<td width="33%" align="left" valign="top"><a href="archive-files.html"
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accesskey="P">Prev</a></td>
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<td width="34%" align="center" valign="top"><a href="index.html"
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accesskey="H">Home</a></td>
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<td width="33%" align="right" valign="top"><a href="archive-files-tar.html"
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accesskey="N">Next</a></td>
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</tr>
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<tr>
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<td width="33%" align="left" valign="top">Archive Files</td>
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<td width="34%" align="center" valign="top"><a href="archive-files.html"
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accesskey="U">Up</a></td>
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<td width="33%" align="right" valign="top"><tt class="COMMAND">tar</tt></td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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