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<title>BuildNumber Task</title>
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<h2 id="buildnumber">BuildNumber</h2>
<h3>Description</h3>
<p>This is a basic task that can be used to track build numbers.</p>
<p>It will first attempt to read a build number from a file (by default, <samp>build.number</samp>
in the current directory), then set the property <code>build.number</code> to the value that was
read in (or to <q>0</q>, if no such value). It will then increment the number by one and write it
back out to the file.  (See the <a href="../Tasks/propertyfile.html">PropertyFile</a> task if you
need finer control over things such as the property name or the number format.)</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>file</td>
    <td>The file to read and write the build number from/to.</td>
    <td>No; defaults to <q>build.number</q></td>
  </tr>
</table>

<h3>Examples</h3>
<p>Read, increment, and write a build number to the default file, <samp>build.number</samp>.</p>
<pre>&lt;buildnumber/&gt;</pre>

<p>Read, increment, and write a build number to the file <samp>mybuild.number</samp>.</p>
<pre>&lt;buildnumber file=&quot;mybuild.number&quot;/&gt;</pre>

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