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<h1 class="SECT1"><a id="ARCHIVE-FILES-BZIP2" name="ARCHIVE-FILES-BZIP2">15.2 <tt
class="COMMAND">bzip2</tt></a></h1>
<p><tt class="COMMAND">bzip2</tt>(1) is an alternative compression program installed on
Slackware Linux. It uses a different compression algorithm from <tt
class="COMMAND">gzip</tt>, which results in some advantages and some disadvantages. The
main advantage for <tt class="COMMAND">bzip2</tt> is the compressed file size. <tt
class="COMMAND">bzip2</tt> will almost always compress better than <tt
class="COMMAND">gzip</tt>. In some instances, this can result in dramatically smaller
files. This can be a great advantage for people on slower modem connections. Also
remember, when downloading software from a public ftp server, it's generally good
netiquette to download the <tt class="FILENAME">.bz2</tt> files instead of the <tt
class="FILENAME">.gz</tt> files, as this results in less overhead for the generous people
hosting the server.</p>
<p>The disadvantage to <tt class="COMMAND">bzip2</tt> is that it is more CPU intensive
than <tt class="COMMAND">gzip</tt>. This means that bzipping a file will generally take
longer and will use more of the CPU than gzipping the file would. When considering which
compression program to use, you must weigh this speed vs. compressed size and determine
which is more important.</p>
<p>The usage of <tt class="COMMAND">bzip2</tt> is nearly identical to <tt
class="COMMAND">gzip</tt>, so not much time will be spent discussing it. Like <tt
class="COMMAND">gunzip</tt>, <tt class="COMMAND">bunzip2</tt> is identical to <tt
class="COMMAND">bzip2 -d</tt>. The primary difference in practical usage is that <tt
class="COMMAND">bzip2</tt> uses the <tt class="FILENAME">.bz2</tt> extension.</p>
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bzip2 <var
class="REPLACEABLE">filename</var></kbd>
<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bunzip2 <var
class="REPLACEABLE">filename.bz2</var></kbd>
<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bzip2 -9 <var
class="REPLACEABLE">filename</var></kbd>
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