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octave-doc-5.1.0-7.1.mga7.noarch.rpm

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<a name="Quitting-Octave"></a>
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<a name="Quitting-Octave-1"></a>
<h3 class="section">2.2 Quitting Octave</h3>
<a name="index-exiting-octave-1"></a>
<a name="index-quitting-octave-1"></a>
<a name="index-finish_002em"></a>
<a name="index-site-exiting-file"></a>

<p>Shutdown is initiated with the <code>exit</code> or <code>quit</code> commands (they are
equivalent).  Similar to startup, Octave has a shutdown process that can be
customized by user script files.  During shutdown Octave will search for the
script file <samp>finish.m</samp> in the function load path.  Commands to save all
workspace variables or cleanup temporary files may be placed there.  Additional
functions to execute on shutdown may be registered with <code>atexit</code>.
</p>
<a name="XREFquit"></a><dl>
<dt><a name="index-exit"></a><em></em> <strong>exit</strong></dt>
<dt><a name="index-exit-1"></a><em></em> <strong>exit</strong> <em>(<var>status</var>)</em></dt>
<dt><a name="index-quit"></a><em></em> <strong>quit</strong></dt>
<dt><a name="index-quit-1"></a><em></em> <strong>quit</strong> <em>(<var>status</var>)</em></dt>
<dd><p>Exit the current Octave session.
</p>
<p>If the optional integer value <var>status</var> is supplied, pass that value to
the operating system as Octave&rsquo;s exit status.  The default value is zero.
</p>
<p>When exiting, Octave will attempt to run the m-file <samp>finish.m</samp> if it
exists.  User commands to save the workspace or clean up temporary files
may be placed in that file.  Alternatively, another m-file may be scheduled
to run using <code>atexit</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFatexit">atexit</a>.
</p></dd></dl>


<a name="XREFatexit"></a><dl>
<dt><a name="index-atexit"></a><em></em> <strong>atexit</strong> <em>(<var>fcn</var>)</em></dt>
<dt><a name="index-atexit-1"></a><em></em> <strong>atexit</strong> <em>(<var>fcn</var>, <var>flag</var>)</em></dt>
<dd><p>Register a function to be called when Octave exits.
</p>
<p>For example,
</p>
<div class="example">
<pre class="example">function last_words ()
  disp (&quot;Bye bye&quot;);
endfunction
atexit (&quot;last_words&quot;);
</pre></div>

<p>will print the message <code>&quot;Bye bye&quot;</code> when Octave exits.
</p>
<p>The additional argument <var>flag</var> will register or unregister <var>fcn</var>
from the list of functions to be called when Octave exits.  If <var>flag</var> is
true, the function is registered, and if <var>flag</var> is false, it is
unregistered.  For example, after registering the function <code>last_words</code>
above,
</p>
<div class="example">
<pre class="example">atexit (&quot;last_words&quot;, false);
</pre></div>

<p>will remove the function from the list and Octave will not call
<code>last_words</code> when it exits.
</p>
<p>Note that <code>atexit</code> only removes the first occurrence of a function
from the list, so if a function was placed in the list multiple times with
<code>atexit</code>, it must also be removed from the list multiple times.
</p>
<p><strong>See also:</strong> <a href="#XREFquit">quit</a>.
</p></dd></dl>


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