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<title>GUnzip/BUnzip2 Task</title>
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<h2 id="unpack">GUnzip/BUnzip2/UnXZ</h2>
<h3>Description</h3>
<p>Expands a resource packed using GZip, BZip2 or XZ.</p>

<p>If <var>dest</var> is a directory the name of the destination file is the same as <var>src</var>
(with the <q>.gz</q>, <q>.bz2</q> or <q>.xz</q> extension removed if present). If <var>dest</var> is
omitted, the parent dir of <var>src</var> 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>

<p>XZ compression support has been added <em>since Apache Ant 1.10.1</em> and depends on external
libraries not included in the Ant distribution.
See <a href="../install.html#librarydependencies">Library Dependencies</a> for more information.</p>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>src</td>
    <td>the file to expand.</td>
    <td>Yes, or a nested resource collection</td>
  </tr>
  <tr>
    <td>dest</td>
    <td>the destination file or directory.</td>
    <td>No</td>
  </tr>
</table>
<h3>Parameters specified as nested elements</h3>

<h4>any <a href="../Types/resources.html">resource</a> or single element resource collection</h4>

<p>The specified resource will be used as <var>src</var>.</p>

<h3>Examples</h3>
<p>Expand <samp>test.tar.gz</samp> to <samp>test.tar</samp></p>
<pre>&lt;gunzip src=&quot;test.tar.gz&quot;/&gt;</pre>

<p>Expand <samp>test.tar.bz2</samp> to <samp>test.tar</samp></p>
<pre>&lt;bunzip2 src=&quot;test.tar.bz2&quot;/&gt;</pre>

<p>Expand <samp>test.tar.xz</samp> to <samp>test.tar</samp></p>
<pre>&lt;unxz src=&quot;test.tar.xz&quot;/&gt;</pre>

<p>Expand <samp>test.tar.gz</samp> to <samp>test2.tar</samp></p>
<pre>&lt;gunzip src=&quot;test.tar.gz&quot; dest=&quot;test2.tar&quot;/&gt;</pre>

<p>Expand <samp>test.tar.gz</samp> to <samp>subdir/test.tar</samp> (assuming <samp>subdir</samp> is
a directory).</p>
<pre>&lt;gunzip src=&quot;test.tar.gz&quot; dest=&quot;subdir&quot;/&gt;</pre>

<p>Download <samp>http://example.org/archive.tar.gz</samp> and expand it to <samp>archive.tar</samp>
in the project's <var>basedir</var> on the fly.</p>
<pre>
&lt;gunzip dest=&quot;.&quot;&gt;
  &lt;url url="http://example.org/archive.tar.gz"/&gt;
&lt;/gunzip&gt;
</pre>

<h3>Related tasks</h3>

<p>The following</p>
<pre>&lt;gunzip src="some-archive.gz" dest="some-dest-dir"/&gt;</pre>
<p>is identical to</p>
<pre>
&lt;copy todir="some-dest-dir"&gt;
  &lt;gzipresource&gt;
    &lt;file file="some-archive.gz"/&gt;
  &lt;/gzipresource&gt;
  &lt;mapper type="glob" from="*.gz" to="*"/&gt;
&lt;/copy&gt;</pre>

<p>The same is also true for <code>&lt;bunzip2&gt;</code> and <code>&lt;bzip2resource&gt;</code>
or <code>&lt;unxz&gt;</code> and <code>&lt;xzresource&gt;</code>.  <code>&lt;copy&gt;</code> offers
additional features like <a href="../Types/filterchain.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>

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