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<title>DefaultExcludes Task</title>
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<h2 id="defaultexcludes">DefaultExcludes</h2>

<p><em>Since Apache Ant 1.6</em></p>

<h3>Description</h3>
<p>Alters the default excludes for all subsequent processing in the build, and prints out the
current default excludes if desired.</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>echo</td>
    <td>whether or not to print out the default excludes</td>
    <td><q>true</q> required if no other attribute specified; defaults to <q>false</q></td>
  </tr>
  <tr>
    <td>default</td>
    <td>go back to hard wired default excludes</td>
    <td><q>true</q> required if no other attribute is specified</td>
  </tr>
  <tr>
    <td>add</td>
    <td>the pattern to add to the default excludes</td>
    <td>if no other attribute is specified</td>
  </tr>
  <tr>
    <td>remove</td>
    <td>remove the specified pattern from the default excludes</td>
    <td>if no other attribute is specified</td>
  </tr>
</table>

<h3>Examples</h3>

<p>Print out the default excludes</p>

<pre>&lt;defaultexcludes echo=&quot;true&quot;/&gt;</pre>

<p>Print out the default excludes and exclude all <samp>*.bak</samp> files in <strong>all</strong>
further processing</p>

<pre>&lt;defaultexcludes echo=&quot;true&quot; add=&quot;**/*.bak&quot;/&gt;</pre>

<p>Silently allow several fileset based tasks to operate on emacs backup files and then restore
normal behavior</p>

<pre>
&lt;defaultexcludes remove=&quot;**/*~&quot;/&gt;

(do several fileset based tasks here)

&lt;defaultexcludes default=&quot;true&quot;/&gt;</pre>

<h3>Notes</h3>
<p>By default the pattern <samp>**/.svn</samp> and <samp>**/.svn/**</samp> are set as default
excludes. Since version 1.3, Subversion supports
the <a href="https://subversion.apache.org/docs/release-notes/1.3.html#_svn-hack"
target="_top">&quot;_svn hack&quot;</a>.  That means, that the svn-libraries evaluate environment
variables and use <samp>.svn</samp> or <samp>_svn</samp> directory regarding to that value. We had
chosen not to evaluate environment variables to get a more reliable build. Instead you have to
change the settings by yourself by changing the exclude patterns:</p>
<pre>
&lt;defaultexcludes remove=&quot;**/.svn&quot;/&gt;
&lt;defaultexcludes remove=&quot;**/.svn/**&quot;/&gt;
&lt;defaultexcludes add=&quot;**/_svn&quot;/&gt;
&lt;defaultexcludes add=&quot;**/_svn/**&quot;/&gt;
</pre>

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