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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 &quot;.gz&quot; or &quot;.bz2&quot;
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>
  </tr>
  <tr>
    <td valign="top">dest</td>
    <td valign="top">the destination file or directory.</td>
    <td align="center" valign="top">No</td>
  </tr>
</table>
<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>
&lt;gunzip src=&quot;test.tar.gz&quot;/&gt;
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>test.tar</i></p>
<blockquote><pre>
&lt;bunzip2 src=&quot;test.tar.bz2&quot;/&gt;
</pre></blockquote>
<p>expands <i>test.tar.bz2</i> to <i>test.tar</i></p>
<blockquote><pre>
&lt;gunzip src=&quot;test.tar.gz&quot; dest=&quot;test2.tar&quot;/&gt;
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>test2.tar</i></p>
<blockquote><pre>
&lt;gunzip src=&quot;test.tar.gz&quot; dest=&quot;subdir&quot;/&gt;
</pre></blockquote>
<p>expands <i>test.tar.gz</i> to <i>subdir/test.tar</i> (assuming
subdir is a directory).</p>
<blockquote><pre>
&lt;gunzip dest=&quot;.&quot;&gt;
  &lt;url url="http://example.org/archive.tar.gz"/&gt;
&lt;/gunzip&gt;
</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>
&lt;gunzip src="some-archive.gz" dest="some-dest-dir"/&gt;
</pre>

is identical to

<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>.  <code>&lt;copy&gt;</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>


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