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<title>GUnzip/BUnzip2 Task</title>
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<h2><a name="unpack">GUnzip/BUnzip2</a></h2>
<h3>Description</h3>
<p>Expands a resource packed using GZip or BZip2.</p>
<p>If <i>dest</i> is a directory the name of the destination file is
the same as <i>src</i> (with the ".gz" or ".bz2"
extension removed if present). If <i>dest</i> is omitted, the parent
dir of <i>src</i> is taken. The file is only expanded if the source
resource is newer than the destination file, or when the destination file
does not exist.</p>
<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
<tr>
<td valign="top"><b>Attribute</b></td>
<td valign="top"><b>Description</b></td>
<td align="center" valign="top"><b>Required</b></td>
</tr>
<tr>
<td valign="top">src</td>
<td valign="top">the file to expand.</td>
<td align="center" valign="top">Yes, or a nested resource collection.</td>
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<tr>
<td valign="top">dest</td>
<td valign="top">the destination file or directory.</td>
<td align="center" valign="top">No</td>
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<h3>Parameters specified as nested elements</h3>
<h4>any <a href="../CoreTypes/resources.html">resource</a> or single element
resource collection</h4>
<p>The specified resource will be used as src.</p>
<h3>Examples</h3>
<blockquote><pre>
<gunzip src="test.tar.gz"/>
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>test.tar</i></p>
<blockquote><pre>
<bunzip2 src="test.tar.bz2"/>
</pre></blockquote>
<p>expands <i>test.tar.bz2</i> to <i>test.tar</i></p>
<blockquote><pre>
<gunzip src="test.tar.gz" dest="test2.tar"/>
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>test2.tar</i></p>
<blockquote><pre>
<gunzip src="test.tar.gz" dest="subdir"/>
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>subdir/test.tar</i> (assuming
subdir is a directory).</p>
<blockquote><pre>
<gunzip dest=".">
<url url="http://example.org/archive.tar.gz"/>
</gunzip>
</pre></blockquote>
<p>downloads <i>http://example.org/archive.tar.gz</i> and expands it
to <i>archive.tar</i> in the project's basedir on the fly.</p>
<h3>Related tasks</h3>
<pre>
<gunzip src="some-archive.gz" dest="some-dest-dir"/>
</pre>
is identical to
<pre>
<copy todir="some-dest-dir">
<gzipresource>
<file file="some-archive.gz"/>
</gzipresource>
<mapper type="glob" from="*.gz" to="*"/>
</copy>
</pre>
<p>The same is also true for <code><bunzip2></code> and
<code><bzip2resource></code>. <code><copy></code> offers
additional features like <a
href="../CoreTypes/filterchains.html">filtering files</a> on the fly,
allowing a file to be mapped to multiple destinations, preserving the
last modified time or a configurable file system timestamp
granularity.</p>
<hr>
<p align="center">Copyright © 2000-2001,2004-2005 The Apache Software Foundation. All rights
Reserved.</p>
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