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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 8. Unset Task</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="Antelope Users Guide"><link rel="up" href="bk03.html" title="Additional Ant Tasks"><link rel="prev" href="bk03ch07.html" title="Chapter 7. Try Task"><link rel="next" href="bk03ch09.html" title="Chapter 9. Variable Task"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 8. Unset Task</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk03ch07.html">Prev</a> </td><th width="60%" align="center">Additional Ant Tasks</th><td width="20%" align="right"> <a accesskey="n" href="bk03ch09.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 8. Unset Task"><div class="titlepage"><div><div><h2 class="title"><a name="Unset"></a>Chapter 8. Unset Task</h2></div></div></div>
@style@
    <p>
The Unset task provides easier access to one of the most used use cases of <a class="link" href="bk03ch09.html" title="Chapter 9. Variable Task">Variable</a>, the ability to unset a property.  By design, Ant properties are immutable, but sometimes it is handy to set a property to a new value.
</p><p>
To use this task in your build files, include a task definition like this:
</p><p>
</p><pre class="programlisting">

    &lt;taskdef name="unset" classname="ise.antelope.tasks.Unset"/&gt;
   
</pre><p>
</p><p>
</p><div class="table"><a name="id2516878"></a><p class="title"><b>Table 8.1. Unset Task Attributes</b></p><div class="table-contents"><table summary="Unset Task Attributes" border="1"><colgroup><col><col><col><col></colgroup><thead><tr><th>Attribute</th><th>Description</th><th>Default</th><th>Required</th></tr></thead><tbody><tr><td>name</td><td>The name of the property to unset.</td><td>None</td><td>Yes, unless 'file' is used.</td></tr><tr><td>file</td><td>The name of a property file.  All properties references in the file will be unset.  This means you can load a bunch of properties from a file, then unset them all with a single line.</td><td>None</td><td>Yes, unless 'name' is used.</td></tr></tbody></table></div></div><p><br class="table-break">
</p><p>
Example:
</p><pre class="programlisting">

&lt;project name="unset_example" basedir="."&gt;
    &lt;taskdef resource="ise/antelope/tasks/antlib.xml"/&gt;
    &lt;property name="x" value="6"/&gt;
    &lt;echo&gt;original value = ${x}&lt;/echo&gt;
    &lt;unset name="x"/&gt;
    &lt;echo&gt;unset: ${x}&lt;/echo&gt;
    &lt;property name="x" value="hello"/&gt;
    &lt;echo&gt;new value = ${x}&lt;/echo&gt;
&lt;/project&gt;

$ ant -f unset_example.xml
Buildfile: unset_example.xml
     [echo] original value = 6
     [echo] unset: ${x}
     [echo] new value = hello

BUILD SUCCESSFUL
Total time: 0 seconds

</pre><p>
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