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<title>Chmod Task</title>
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<body>

<h2 id="chmod">Chmod</h2>
<h3>Description</h3>
<p>Changes the permissions of a file or all files inside specified
directories. Right now it has effect only under Unix or NonStop Kernel (Tandem).
The permissions are also UNIX style, like the argument for the chmod command.</p>
<p>See the section on <a href="../dirtasks.html#directorybasedtasks">directory based
tasks</a>, on how the inclusion/exclusion of files works, and how to
write patterns.</p>

<p>This task holds an implicit <a
href="../Types/fileset.html">FileSet</a> and supports all of
FileSet's attributes and nested elements directly. More sets can be
specified using nested <code>&lt;fileset&gt;</code> or
<code>&lt;dirset&gt;</code> (<em>since Apache Ant 1.6</em>) elements.</p>

<p>Starting with Ant 1.6, this task also supports nested <a
href="../Types/filelist.html">filelist</a>s.</p>

<p>Starting with Ant 1.7, this task supports arbitrary <a
href="../Types/resources.html#collection">Resource Collection</a>s
as nested elements.</p>

<p>By default this task will use a single invocation of the underlying
chmod command.  If you are working on a large number of files this may
result in a command line that is too long for your operating system.
If you encounter such problems, you should set the maxparallel
attribute of this task to a non-zero value.  The number to use highly
depends on the length of your file names (the depth of your directory
tree) and your operating system, so you'll have to experiment a
little.  POSIX recommends command line length limits of at least 4096
characters, this may give you an approximation for the number you
could use as initial value for these experiments.</p>

<p>By default this task won't do anything unless it detects it is
  running on a Unix system.  If you know for sure that you have a
  "chmod" executable on your PATH that is command line compatible with
  the Unix command, you can use the task's os attribute and set its
  value to your current os.</p>

<p>See the <a href="setpermissions.html">setpermissions</a> task for a
  platform independent alternative.</p>

<h3>Parameters</h3>
<table>
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td valign="top" align="center"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">file</td>
    <td valign="top">the file or single directory of which the permissions
      must be changed.</td>
    <td valign="top" align="center" rowspan="2">exactly one of the two or nested <code>&lt;fileset/list&gt;</code> elements.</td>
  </tr>
  <tr>
    <td valign="top">dir</td>
    <td valign="top">the directory which holds the files whose permissions
      must be changed.<br/>
      <b>Note:</b> for backwards compatibility
      reasons <code>&lt;chmod&nbsp;dir="some-dir"/&gt;</code> will
      only change the permissions on "some-dir" but not recurse into
      it, unless you also specify any patterns.</td>
  </tr>
  <tr>
    <td valign="top">perm</td>
    <td valign="top">the new permissions.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">includes</td>
    <td valign="top">comma- or space-separated list of patterns of files that must be
      included.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">excludes</td>
    <td valign="top">comma- or space-separated list of patterns of files that must be
      excluded. No files (except default excludes) are excluded when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">defaultexcludes</td>
    <td valign="top">indicates whether default excludes should be used or not
      (&quot;yes&quot;/&quot;no&quot;). Default excludes are used when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">parallel</td>
    <td valign="top">process all specified files using a single
      <code>chmod</code> command. Defaults to true.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">type</td>
    <td valign="top">One of <i>file</i>, <i>dir</i> or
      <i>both</i>. If set to <i>file</i>, only the permissions of
      plain files are going to be changed. If set to <i>dir</i>, only
      the directories are considered.<br>
      <strong>Note:</strong> The type attribute does not apply to
      nested <i>dirset</i>s - <i>dirset</i>s always implicitly
      assume type to be <i>dir</i>.</td>
    <td align="center" valign="top">No, default is <i>file</i></td>
  </tr>
  <tr>
    <td valign="top">maxparallel</td>
    <td valign="top">Limit the amount of parallelism by passing at
      most this many sourcefiles at once.  Set it to &lt;= 0 for
      unlimited.  Defaults to unlimited.  <em>Since Ant 1.6.</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
    <td valign="top">Whether to print a summary after execution or not.
      Defaults to <code>false</code>.  <em>Since Ant 1.6.</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">os</td>
    <td valign="top">list of Operating Systems on which the command may be
      executed.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">osfamily</td>
    <td valign="top">OS family as used in
      the <a href="conditions.html#os">&lt;os&gt;</a> condition.</td>
    <td align="center" valign="top">No - defaults to "unix"</td>
  </tr>
</table>
<h3>Examples</h3>
  <blockquote><pre>
&lt;chmod file=&quot;${dist}/start.sh&quot; perm=&quot;ugo+rx&quot;/&gt;
</pre></blockquote>
<p>makes the &quot;start.sh&quot; file readable and executable for anyone on a
UNIX system.</p>
<blockquote><pre>
&lt;chmod file=&quot;${dist}/start.sh&quot; perm=&quot;700&quot;/&gt;
</pre></blockquote>
<p>makes the &quot;start.sh&quot; file readable, writable and executable only for the owner on a
UNIX system.</p>
<blockquote>
<pre>
&lt;chmod dir=&quot;${dist}/bin&quot; perm=&quot;ugo+rx&quot;
       includes=&quot;**/*.sh&quot;/&gt;
</pre>
</blockquote>
<p>makes all &quot;.sh&quot; files below <code>${dist}/bin</code>
readable and executable for anyone on a UNIX system.</p>
<blockquote>
<pre>
&lt;chmod perm=&quot;g+w&quot;&gt;
  &lt;fileset dir=&quot;shared/sources1&quot;&gt;
    &lt;exclude name=&quot;**/trial/**&quot;/&gt;
  &lt;/fileset&gt;
  &lt;fileset refid=&quot;other.shared.sources&quot;/&gt;
&lt;/chmod&gt;
</pre>
</blockquote>
<p>makes all files below <code>shared/sources1</code> (except those
below any directory named trial) writable for members of the same
group on a UNIX system. In addition all files belonging to a FileSet
with <code>id</code> <code>other.shared.sources</code> get the same
permissions.</p>

<blockquote>
<pre>
&lt;chmod perm=&quot;go-rwx&quot; type=&quot;file&quot;&gt;
  &lt;fileset dir=&quot;/web&quot;&gt;
    &lt;include name=&quot;**/*.cgi&quot;/&gt;
    &lt;include name=&quot;**/*.old&quot;/&gt;
  &lt;/fileset&gt;
  &lt;dirset dir=&quot;/web&quot;&gt;
    &lt;include name=&quot;**/private_*&quot;/&gt;
  &lt;/dirset&gt;
&lt;/chmod&gt;
</pre>
</blockquote>

<p>keeps non-owners from touching cgi scripts, files with a <code>.old</code>
extension or directories beginning with <code>private_</code>. A directory
ending in <code>.old</code> or a file beginning with private_ would remain
unaffected.</p>


  <h3>Note on maxparallel attribute</h3>
  <p>
    Some shells have a limit of the number of characters that
    a command line may contain.
    This maximum limit varies from shell to shell and from operating
    system to operating system.
    If one has a large number of files to change mode on, consider
    using the <em>maxparallel</em> attribute. For example
    when using AIX and the limit is reached, the system responds
    with a warning: "Warning:
    UNIXProcess.forkAndExec native error: The parameter or environment lists
    are too long". A value of about 300 seems to result in a
    command line that is acceptable.
  </p>
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