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<a name="Logging-Output-1"></a>
<h3 class="section">2.4 Logging Output</h3>
<a name="index-logging-GDB-output"></a>
<a name="index-save-GDB-output-to-a-file"></a>

<p>You may want to save the output of <small>GDB</small> commands to a file.
There are several commands to control <small>GDB</small>&rsquo;s logging.
</p>
<dl compact="compact">
<dd><a name="index-set-logging"></a>
</dd>
<dt><code>set logging on</code></dt>
<dd><p>Enable logging.
</p></dd>
<dt><code>set logging off</code></dt>
<dd><p>Disable logging.
<a name="index-logging-file-name"></a>
</p></dd>
<dt><code>set logging file <var>file</var></code></dt>
<dd><p>Change the name of the current logfile.  The default logfile is <samp>gdb.txt</samp>.
</p></dd>
<dt><code>set logging overwrite [on|off]</code></dt>
<dd><p>By default, <small>GDB</small> will append to the logfile.  Set <code>overwrite</code> if
you want <code>set logging on</code> to overwrite the logfile instead.
</p></dd>
<dt><code>set logging redirect [on|off]</code></dt>
<dd><p>By default, <small>GDB</small> output will go to both the terminal and the logfile.
Set <code>redirect</code> if you want output to go only to the log file.
</p></dd>
<dt><code>set logging debugredirect [on|off]</code></dt>
<dd><p>By default, <small>GDB</small> debug output will go to both the terminal and the logfile.
Set <code>debugredirect</code> if you want debug output to go only to the log file.
<a name="index-show-logging"></a>
</p></dd>
<dt><code>show logging</code></dt>
<dd><p>Show the current values of the logging settings.
</p></dd>
</dl>

<p>You can also redirect the output of a <small>GDB</small> command to a
shell command.  See <a href="Shell-Commands.html#pipe">pipe</a>.
</p>


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