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<a name="A-Sample-Command-Description-1"></a>
<h4 class="subsubsection">1.3.5.2 A Sample Command Description</h4>
<a name="index-command-descriptions"></a>

<p>Commands are functions that may be called without surrounding their arguments
in parentheses.  Command descriptions have a format similar to function
descriptions.  For example, here is the description for Octave&rsquo;s <code>diary</code>
command:
</p>
<dl>
<dt><a name="index-diary"></a><em></em> <strong>diary</strong></dt>
<dt><a name="index-diary-1"></a><em></em> <strong>diary</strong> <em>on</em></dt>
<dt><a name="index-diary-2"></a><em></em> <strong>diary</strong> <em>off</em></dt>
<dt><a name="index-diary-3"></a><em></em> <strong>diary</strong> <em><var>filename</var></em></dt>
<dt><a name="index-diary-4"></a><em>[<var>status</var>, <var>diaryfile</var>] =</em> <strong>diary</strong></dt>
<dd><p>Record a list of all commands <em>and</em> the output they produce, mixed
together just as they appear on the terminal.
</p>
<p>Valid options are:
</p>
<dl compact="compact">
<dt>on</dt>
<dd><p>Start recording a session in a file called <samp>diary</samp> in the current working
directory.
</p>
</dd>
<dt>off</dt>
<dd><p>Stop recording the session in the diary file.
</p>
</dd>
<dt><var>filename</var></dt>
<dd><p>Record the session in the file named <var>filename</var>.
</p></dd>
</dl>

<p>With no input or output arguments, <code>diary</code> toggles the current diary
state.
</p>
<p>If output arguments are requested, <code>diary</code> ignores inputs and returns
the current status.  The boolean <var>status</var> indicates whether recording is on
or off, and <var>diaryfile</var> is the name of the file where the session is
stored.
</p>
<p><strong>See also:</strong> history, evalc.
</p></dd></dl>





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