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<h2 id="apply">Apply</h2>
<p><em>The name <code>execon</code> is <u>deprecated</u> and only kept for backwards
compatibility.</em></p>
<h3>Description</h3>
<p>Executes a system command. When the <var>os</var> attribute is specified, then the command is
only executed when Apache Ant is run on one of the specified operating systems.</p>

<p>The files and/or directories of a number of <a href="../Types/resources.html#collection">Resource
Collection</a>s &ndash;- including but not restricted
to <a href="../Types/fileset.html">FileSet</a>s, <a href="../Types/dirset.html">DirSet</a>s
(<em>since Ant 1.6</em>) or <a href="../Types/filelist.html">FileList</a>s (<em>since Ant 1.6</em>)
&ndash;- are passed as arguments to the system command.</p>
<p>If you specify a nested <a href="../Types/mapper.html">mapper</a>, the timestamp of each source
file is compared to the timestamp of a target file which is defined by the
nested <code>mapper</code> element and searched for in the given <var>dest</var>, if specified.</p>
<p>At least one <code>fileset</code> or <code>filelist</code> is required, and you must not specify
more than one <code>mapper</code>.</p>

<p>Note that you cannot interact with the forked program, the only way to send input to it is via
the <var>input</var> and <var>inputstring</var> attributes.</p>

<h4 id="background">Running Ant as a background process on Unix(-like) systems</h4>

<p>If you run Ant as a background process (like <kbd>ant &amp;</kbd>) and use
the <code>&lt;apply&gt;</code> task with <var>spawn</var> set to <q>false</q>, you must provide
explicit input to the forked process or Ant will be suspended because it tries to read from the
standard input.</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>executable</td>
    <td>the command to execute without any command line arguments.</td>
    <td>Yes</td>
  </tr>
  <tr>
    <td>dest</td>
    <td>the directory where the command is expected to place target files when it is executed.</td>
    <td>No; ignored unless a nested mapper is specified; by default, the target filenames returned
      by the mapper will be interpreted as absolute paths</td>
  </tr>
  <tr>
    <td>spawn</td>
    <td>whether or not you want the commands to be spawned.<br/>  If you spawn a command, its output
    will not be logged by Ant.<br/>  The input, output, error, and result property settings are not
    active when spawning a process.<br/>  <em>since Ant 1.6</em></td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>dir</td>
    <td>the directory in which the command should be executed.</td>
    <td>No; if <var>vmlauncher</var> is <q>true</q>, defaults to the current working directory,
      otherwise the project's <var>basedir</var></td>
  </tr>
  <tr>
    <td>relative</td>
    <td>whether the filenames should be passed on the command line as relative pathnames (relative
      to the base directory of the corresponding fileset/list for source files or
      the <var>dest</var> attribute for target files).</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>forwardslash</td>
    <td>whether the file names should be passed with forward slashes even if the operating system
      requires other file separator. The option is ignored if the system file separator is a forward
      slash.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>os</td>
    <td>list of Operating Systems on which the command may be executed.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>osfamily</td>
    <td>OS family as used in the <code>&lt;os&gt;</code> condition.
    <em>since Ant 1.7</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>output</td>
    <td>the file to which the output of the command should be redirected.  If the error stream is
    not also redirected to a file or property, it will appear in this output.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>error</td>
    <td>The file to which the standard error of the command should be redirected.  <em>since Ant
    1.6</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>logError</td>
    <td>This attribute is used when you wish to see error output in Ant's log and you are
    redirecting output to a file/property. The error output will not be included in the output
    file/property. If you redirect error with the <var>error</var> or <var>errorProperty</var>
    attributes, this will have no effect.  <em>since Ant 1.6</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>append</td>
    <td>whether output should be appended to or overwrite an existing file.  If you
      set <var>parallel</var> to <q>false</q>, you will probably want to set this one
      to <q>true</q>.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>outputproperty</td>
    <td>the name of a property in which the output of the command should be stored.  Unless the
    error stream is redirected to a separate file or stream, this property will include the error
    output.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>errorproperty</td>
    <td>The name of a property in which the standard error of the command should be
      stored.  <em>since Ant 1.6</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>input</td>
    <td>A file from which the executed command's standard input is taken. This attribute is mutually
    exclusive with the <var>inputstring</var> attribute.  <em>since Ant 1.6</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>inputstring</td>
    <td>A string which serves as the input stream for the executed command. This attribute is
    mutually exclusive with the <var>input</var> attribute.  <em>since Ant 1.6</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>resultproperty</td>
    <td>the name of a property in which the return code of the command should be stored. Only of
      interest if <var>failonerror</var> is <q>false</q>. If you set <var>parallel</var>
      to <q>false</q>, only the result of the first execution will be stored.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>timeout</td>
    <td>Stop the command if it doesn't finish within the specified time (given in
      milliseconds).</td>
    <td>No</td>
  </tr>
  <tr>
    <td>failonerror</td>
    <td>Stop the build process if the command exits with a return code other than <q>0</q>.</td>
    <td>No; defaults to <q>false</q></td>
  </tr>
  <tr>
    <td>failifexecutionfails</td>
    <td>Stop the build if we can't start the program.</td>
    <td>No; defaults to <q>true</q></td>
  </tr>
  <tr>
    <td>skipemptyfilesets</td>
    <td>Don't run the command, if no source files have been found or are newer than their
      corresponding target files.  Despite its name, this attribute applies to filelists as
      well.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>parallel</td>
    <td>Run the command only once, appending all files as arguments. If <q>false</q>, command will
      be executed once for every file.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>type</td>
    <td>One of <q>file</q>, <q>dir</q> or <q>both</q>. If set to <q>file</q>, only the names of
      plain files will be sent to the command. If set to <q>dir</q>, only the names of directories
      are considered.<br/>
      <strong>Note</strong>: The <var>type</var> attribute does not apply to
      nested <code>dirset</code>s&mdash;<code>dirset</code>s always implicitly assume type to
      be <q>dir</q>.</td>
    <td>No; default is <q>file</q></td>
  </tr>
  <tr>
    <td>newenvironment</td>
    <td>Do not propagate old environment when new environment variables are specified.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>vmlauncher</td>
    <td>Run command using the JVM's execution facilities where available. If set to <q>false</q> the
      underlying OS's shell, either directly or through the <kbd>antRun</kbd> scripts, will be
      used.  Under some operating systems, this gives access to facilities not normally available
      through JVM including, under Windows, being able to execute scripts, rather than their
      associated interpreter.  If you want to specify the name of the executable as a relative path
      to the directory given by the <var>dir</var> attribute, it may become necessary to
      set <var>vmlauncher</var> to <q>false</q> as well.</td>
    <td>No; default is <q>true</q></td>
  </tr>
  <tr>
    <td>resolveExecutable</td>
    <td>When this attribute is <q>true</q>, the name of the executable if resolved firstly against
      the project <var>basedir</var> and if that does not exist, against the execution directory if
      specified. On Unix systems, if you only want to allow execution of commands in the user's
      path, set this to <q>false</q>.
    <em>since Ant 1.6</em></td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>maxparallel</td>
    <td>Limit the amount of parallelism by passing at most this many sourcefiles at once.  Set it to
      negative integer for unlimited. <em>Since Ant 1.6</em>.</td>
    <td>No, unlimited by default</td>
  </tr>
  <tr>
    <td>addsourcefile</td>
    <td>Whether source file names should be added to the command automatically. <em>Since Ant
      1.6</em>.</td>
    <td>No; default is <q>true</q></td>
  </tr>
  <tr>
    <td>verbose</td>
    <td>Whether to print a summary after execution or not.  <em>Since Ant 1.6</em>.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>ignoremissing</td>
    <td>Whether to ignore nonexistent files specified via filelists.  <em>Since Ant 1.6.2</em>.</td>
    <td>No; default is <q>true</q></td>
  </tr>
  <tr>
    <td>force</td>
    <td>Whether to bypass timestamp comparisons for target files.  <em>Since Ant 1.6.3</em>.</td>
    <td>No; default is <q>false</q></td>
  </tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>fileset</h4>
<p>You can use any number of nested <code>&lt;fileset&gt;</code> elements to define the files for
this task and refer to <code>&lt;fileset&gt;</code>s defined elsewhere.</p>

<h4>filelist</h4>
<p><em>Since Ant 1.6</em></p>
<p>You can use any number of nested <code>&lt;filelist&gt;</code> elements to define the files for
this task and refer to <code>&lt;filelist&gt;</code>s defined elsewhere.</p>

<h4>dirset</h4>
<p><em>Since Ant 1.6</em></p>
<p>You can use any number of nested <code>&lt;dirset&gt;</code> elements to define the directories
for this task and refer to <code>&lt;dirset&gt;</code>s defined elsewhere.</p>

<h4>Any other <a href="../Types/resources.html#collection">resource collection</a></h4>
<p><em>Since Ant 1.7</em></p>
<p>You can use any number of nested resource collections.</p>

<h4>mapper</h4>
<p>A single <code>&lt;mapper&gt;</code> specifies the target files relative to the <var>dest</var>
attribute for dependency checking. If the <var>dest</var> attribute is specified it will be used as
a base directory for resolving relative pathnames returned by the mapper. At least one
<code>&lt;fileset&gt;</code> or <code>&lt;filelist&gt;</code> is required.</p>

<h4>arg</h4>
<p>Command line arguments should be specified as nested <code>&lt;arg&gt;</code>
elements. See <a href="../using.html#arg">Command line arguments</a>.</p>

<h4>srcfile</h4>
<p>By default the file names of the source files will be added to the end of the command line
(unless you set <var>addsourcefile</var> to <q>false</q>). If you need to place it somewhere
different, use a nested <code>&lt;srcfile&gt;</code> element between your <code>&lt;arg&gt;</code>
elements to mark the insertion point.</p>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>prefix</td>
    <td>a prefix to place in front of the file name when building the command line
    argument.  <em>Since Ant 1.8.0</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>suffix</td>
    <td>a suffix to append to the file name when building the command line argument.  <em>Since Ant
    1.8.0</em></td>
    <td>No</td>
  </tr>
</table>
<h4>targetfile</h4>
<p><code>&lt;targetfile&gt;</code> is similar to <code>&lt;srcfile&gt;</code> and marks the position
of the target filename on the command line. If omitted, the target filenames will not be added to
the command line at all. This element can only be specified if you also define a nested mapper.</p>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>prefix</td>
    <td>a prefix to place in front of the file name when building the command line
    argument.  <em>Since Ant 1.8.0</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>suffix</td>
    <td>a suffix to append to the file name when building the command line argument.  <em>Since Ant
    1.8.0</em></td>
    <td>No</td>
  </tr>
</table>
<h4>env</h4>
<p>It is possible to specify environment variables to pass to the system command via
nested <code>&lt;env&gt;</code> elements. See the description in the section
about <a href="exec.html#env">exec</a></p>
<h4>redirector</h4>
<em>Since Ant 1.6.2</em>
<p>A nested <a href="../Types/redirector.html">I/O Redirector</a> can be specified.  &lt;apply&gt;'s
behavior is like that of <a href="exec.html#redirector">exec</a> with regard to redirectors, with
the exception that, in non-<var>parallel</var> mode, file mapping will take place with each
iteration.  This grants the user the capacity to receive input from, and send output to, different
files for each sourcefile.</p>
<p>In <var>parallel</var> mode the redirector will be reset for each batch of executions
(with <var>maxparallel</var> &gt; 0) and null will be used a source file just like it is in the case
of <code>exec</code>.</p>
<h3>Examples</h3>
<p>Invoke <kbd>ls -l</kbd>, adding the absolute filenames of all files below <samp>/tmp</samp> not
ending in <samp>.txt</samp> and all files of the FileSet with <var>id</var> <samp>other.files</samp>
to the command line.</p>
<pre>
&lt;apply executable=&quot;ls&quot;&gt;
  &lt;arg value=&quot;-l&quot;/&gt;
  &lt;fileset dir=&quot;/tmp&quot;&gt;
    &lt;patternset&gt;
      &lt;exclude name=&quot;**/*.txt&quot;/&gt;
    &lt;/patternset&gt;
  &lt;/fileset&gt;
  &lt;fileset refid=&quot;other.files&quot;/&gt;
&lt;/apply&gt;</pre>

<p>Invoke <kbd>somecommand arg1 SOURCEFILENAME arg2</kbd> for each file in <samp>/tmp</samp>
replacing <code>SOURCEFILENAME</code> with the absolute filename of each file in
turn. If <var>parallel</var> had been set to <q>true</q>, <code>SOURCEFILENAME</code> would be
replaced with the absolute filenames of all files separated by spaces.</p>
<pre>
&lt;apply executable=&quot;somecommand&quot; parallel=&quot;false&quot;&gt;
  &lt;arg value=&quot;arg1&quot;/&gt;
  &lt;srcfile/&gt;
  &lt;arg value=&quot;arg2&quot;/&gt;
  &lt;fileset dir=&quot;/tmp&quot;/&gt;
&lt;/apply&gt;
</pre>

<p>Invoke <kbd>cc -c -o TARGETFILE SOURCEFILE</kbd> for each <samp>.c</samp> file that is newer than
the corresponding <samp>.o</samp>, replacing <code>TARGETFILE</code> with the absolute filename of
the <samp>.o</samp> and <code>SOURCEFILE</code> with the absolute name of the <samp>.c</samp>
file.</p>
<pre>
&lt;apply executable=&quot;cc&quot; dest=&quot;src/C&quot; parallel=&quot;false&quot;&gt;
  &lt;arg value=&quot;-c&quot;/&gt;
  &lt;arg value=&quot;-o&quot;/&gt;
  &lt;targetfile/&gt;
  &lt;srcfile/&gt;
  &lt;fileset dir=&quot;src/C&quot; includes=&quot;*.c&quot;/&gt;
  &lt;mapper type=&quot;glob&quot; from=&quot;*.c&quot; to=&quot;*.o&quot;/&gt;
&lt;/apply&gt;</pre>

<p>Apply the fictitious <kbd>processfile</kbd> executable to all files matching <samp>*.file</samp>
in the <samp>src</samp> directory.  The <samp>out</samp> <code>&lt;mapper&gt;</code> has been set up
to map <samp>*.file</samp> to <samp>*.out</samp>, then this <code>&lt;mapper&gt;</code> is used to
specify <code>targetfile</code>s for this <code>&lt;apply&gt;</code> task.  A reference
to <samp>out</samp> is then used as an <code>&lt;outputmapper&gt;</code> nested in
a <code>&lt;redirector&gt;</code>, which in turn is nested beneath this <code>&lt;apply&gt;</code>
instance.  This allows us to perform dependency checking against output files&mdash;the target files
in this case.</p>
<pre>
&lt;mapper id=&quot;out&quot; type=&quot;glob&quot;
           from=&quot;src${file.separator}*.file&quot;
           to=&quot;dest${file.separator}*.out&quot;/&gt;

&lt;apply executable=&quot;processfile&quot; dest=&quot;dest&quot;&gt;
  &lt;fileset dir=&quot;src&quot; includes=&quot;*.file&quot;/&gt;
  &lt;mapper refid=&quot;out&quot;/&gt;
  &lt;redirector&gt;
    &lt;outputmapper refid=&quot;out&quot;/&gt;
  &lt;/redirector&gt;
&lt;/apply&gt;</pre>

<p>Apply the <kbd>ls</kbd> executable to all directories in the <code>PATH</code>, effectively
listing all executables that are available on the <code>PATH</code>.</p>
<pre>
&lt;apply executable="ls" parallel="true"
       force="true" dest="${basedir}" append="true" type="both"&gt;
  &lt;path&gt;
    &lt;pathelement path="${env.PATH}"/&gt;
  &lt;/path&gt;
  &lt;identitymapper/&gt;
&lt;/apply&gt;</pre>

<p>Convert all JavaScript files in the <samp>src</samp> directory using the command <kbd>jsmin &lt;
src/a.js &gt; dest/a.js</kbd>. Because the filename itself should not be passed to
the <code>jsmin</code> program, the <var>addsourcefile</var> is set to <q>false</q>.</p>
<pre>
&lt;apply executable="jsmin" addsourcefile="false"&gt;
    &lt;!-- Collect the JS-files --&gt;
    &lt;fileset dir="src" includes="*.js"/&gt;
    &lt;redirector&gt;
        &lt;!-- redirect STDIN; fileset collects relative to its dir, but we need --&gt;
        &lt;!-- relative to basedir --&gt;
        &lt;inputmapper type="glob" from="*" to="src/*"/&gt;
        &lt;!-- redirect STDOUT to file in dest-dir --&gt;
        &lt;outputmapper id="out" type="glob" from="*.js" to="dest/*.js"/&gt;
    &lt;/redirector&gt;
&lt;/apply&gt;</pre>

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