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<h2><a name="sshexec">SSHEXEC</a></h2>
<h3>Description</h3>

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

<p>Runs a command on a remote machine running SSH daemon.
</p>

<p><b>Note:</b> This task depends on external libraries not included
in the Ant distribution.  See <a
href="../install.html#librarydependencies">Library Dependencies</a>
for more information.  This task has been tested with jsch-0.1.29 and above
and won't work with versions of jsch earlier than
0.1.28.</p>

<p>See also the <a href="scp.html">scp task</a></p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">host</td>
    <td valign="top">The hostname or IP address of the remote host to which you wish to connect.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">username</td>
    <td valign="top">The username on the remote host to which you are connecting.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">command</td>
    <td valign="top">The command to run on the remote host.</td>
    <td valian="top" align="center">Either this or commandResource must be set</td>
  </tr>
  <tr>
    <td valign="top">commandResource</td>
    <td valign="top">The resource (file) that contains the commands to run on the remote host.
    Since Ant 1.7.1</td>
    <td valian="top" align="center">Either this or command must be set</td>
  </tr>
  <tr>
    <td valign="top">port</td>
    <td valign="top">The port to connect to on the remote host.</td>
    <td valian="top" align="center">No, defaults to 22.</td>
  </tr>
  <tr>
    <td valign="top">trust</td>

    <td valign="top">This trusts all unknown hosts if set to yes/true.<br>
      <strong>Note</strong> If you set this to false (the default), the
      host you connect to must be listed in your knownhosts file, this
      also implies that the file exists.</td>
    <td valian="top" align="center">No, defaults to No.</td>
  </tr>
  <tr>
    <td valign="top">knownhosts</td>
    <td valign="top">This sets the known hosts file to use to validate
    the identity of the remote host.  This must be a SSH2 format file.
    SSH1 format is not supported.</td>
    <td valian="top" align="center">No, defaults to
    ${user.home}/.ssh/known_hosts.</td>
  </tr>
  <tr>
    <td valign="top">failonerror</td>
     <td valign="top">Whether to halt the build if the command does not complete successfully.
     </td>
     <td valign="top" align="center">No; defaults to true.</td>
  </tr>
  <tr>
    <td valign="top">password</td>
     <td valign="top">The password.</td>
     <td valign="top" align="center">Not if you are using key based
     authentication or the password has been given in the file or
     todir attribute.</td>
  </tr>
  <tr>
    <td valign="top">keyfile</td>
     <td valign="top">Location of the file holding the private key.</td>
     <td valign="top" align="center">Yes, if you are using key based
     authentication.</td>
  </tr>
  <tr>
    <td valign="top">passphrase</td>
     <td valign="top">Passphrase for your private key.</td>
     <td valign="top" align="center">No, defaults to an empty string.</td>
  </tr>
  <tr>
    <td valign="top">suppresssystemout</td>
    <td valign="top">Whether to suppress system out.
      <em>since Ant 1.9.0</em></td>
    <td align="center" valign="top">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">suppresssystemerr</td>
    <td valign="top">Whether to suppress system err.
      <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">output</td>
    <td valign="top">Name of a file to which to write the output.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">errorOutput</td>
    <td valign="top">The file to which the standard error of the
    command should be redirected.  <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">append</td>
    <td valign="top">Whether output file should be appended to or overwritten. Defaults to false, meaning overwrite any existing file.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">errAppend</td>
    <td valign="top">Whether errorOutput file should be appended to or
    overwritten. Defaults to false, meaning overwrite any existing
    file.  <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">outputproperty</td>
    <td valign="top">The name of a property in which the output of the 
      command should be stored.  If you use the commandResource
      attribute, each command's output will be prefixed by the
      command itself.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">errorproperty</td>
    <td valign="top">The name of a property in which the standard error of the
      command should be stored.  <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">resultproperty</td>
    <td valign="top">the name of a property in which the return code
      of the command should be stored. Only of interest if
      failonerror=false.  <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">timeout</td>
    <td valign="top">Stop the command if it doesn't finish within the
      specified time (given in milliseconds <b>unlike telnet, which
        expects a timeout in seconds</b>).
      Defaults to 0 which means &quot;wait forever&quot;.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">input</td>
    <td valign="top">A file from which the executed command's standard
      input is taken. This attribute is mutually exclusive with the
      inputstring and inputproperty attributes.<br/>
      When executing more than one command via commandResource, input
      will be read for each command.
      <em>since Ant 1.8.0</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
    <td valign="top">Determines whether sshexec outputs verbosely to the user.<br/> 
    Similar output is generated as the ssh commandline tool wit the -v option. 
    <em>since Ant 1.8.0</em></td>
    <td align="center">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">inputproperty</td>
    <td valign="top">Name of a property who's content serves as the
      input stream for the executed command. This attribute is
      mutually exclusive with the input and inputstring
      attributes.<br/>
      When executing more than one command via commandResource, input
      will be read for each command.
      <em>since Ant 1.8.0</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">inputstring</td>
    <td valign="top">A string which serves as the input stream for the
      executed command. This attribute is mutually exclusive with the
      input and inputproperty attributes.<br/>
      When executing more than one command via commandResource, input
      will be read for each command.
      <em>since Ant 1.8.3</em></td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">usepty</td>
    <td valign="top">Whether to allocate a pseudo-tty (like ssh -t).
      <em>since Ant 1.8.3</em></td>
    <td align="center" valign="top">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">useSystemIn</td>
    <td valign="top">Whether to pass the current standard input to the
      remote process.
      <em>since Ant 1.9.4</em></td>
    <td align="center" valign="top">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">serverAliveIntervalSeconds</td>
    <td valign="top">Sets a timeout interval in seconds after which if no data has
      been received from the server, the task will send a message through
      the encrypted channel to request a response from the server.
      <em>since Ant 1.9.7</em></td>
    <td align="center" valign="top">No, the default is 0, indicating
      that these messages will not be sent to the server</td>
  </tr>
  <tr>
    <td valign="top">serverAliveCountMax</td>
    <td valign="top">The number of server alive messages which may be
      sent without receiving any messages back from the server. Only
      used if serverAliveIntervalSeconds is not 0.
      <em>since Ant 1.9.7</em></td>
    <td align="center" valign="top">No, defaults to 3</td>
  </tr>
</table>

<h3>Examples</h3>
<p><b>Run a command on a remote machine using password authentication</b></p>
<pre>
  &lt;sshexec host=&quot;somehost&quot;
	username=&quot;dude&quot;
	password=&quot;yo&quot;
	command=&quot;touch somefile&quot;/&gt;
</pre>

<p><b>Run a command on a remote machine using key authentication</b></p>
<pre>
  &lt;sshexec host=&quot;somehost&quot;
	username=&quot;dude&quot;
	keyfile=&quot;${user.home}/.ssh/id_dsa&quot;
	passphrase=&quot;yo its a secret&quot;
	command=&quot;touch somefile&quot;/&gt;
</pre>

<p><b>Run a command on a remote machine using key authentication with no passphrase</b></p>
<pre>
  &lt;sshexec host=&quot;somehost&quot;
	username=&quot;dude&quot;
	keyfile=&quot;${user.home}/.ssh/id_dsa&quot;
	command=&quot;touch somefile&quot;/&gt;
</pre>

<p><b>Run a set of commands from a command resource (file) on a remote machine using key authentication with no passphrase</b></p>
<pre>
  &lt;sshexec host=&quot;somehost&quot;
	username=&quot;dude&quot;
	keyfile=&quot;${user.home}/.ssh/id_dsa&quot;
	commandResource=&quot;to_run&quot;/&gt;
</pre>


<p><strong>Security Note:</strong>  Hard coding passwords and/or usernames
in sshexec task can be a serious security hole.  Consider using variable
substitution and include the password on the command line.  For example:<br>
<pre>
  &lt;sshexec host=&quot;somehost&quot;
	username=&quot;${username}&quot;
	password=&quot;${password}&quot;
	command=&quot;touch somefile&quot;/&gt;
</pre>
Invoking ant with the following command line:
<pre>
    ant -Dusername=me -Dpassword=mypassword target1 target2
</pre>

Is slightly better, but the username/password is exposed to all users
on an Unix system (via the ps command). The best approach is to use
the
<code>&lt;input&gt;</code> task and/or retrieve the password from a (secured)
.properties file.
</p>
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