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<title>AVRDUDE: 4.1 AVRDUDE Defaults</title>
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<a name="AVRDUDE-Defaults-1"></a>
<h2 class="section">4.1 AVRDUDE Defaults</h2>
<a name="index-AVRDUDE-defaults"></a>
<dl compact="compact">
<dt> <code>avrdude_conf_version = &quot;<var>build-time-version</var>&quot;;</code></dt>
<dd><p>Automatically set during the build process.
</p>
</dd>
<dt> <code>default_parallel = &quot;<var>default-parallel-device</var>&quot;;</code></dt>
<dd><a name="index-default_005fparallel"></a>
<p>Assign the default parallel port device. Can be overridden using the
&lsquo;<samp>-P</samp>&rsquo; option.
</p>
</dd>
<dt> <code>default_serial = &quot;<var>default-serial-device</var>&quot;;</code></dt>
<dd><a name="index-default_005fserial"></a>
<p>Assign the default serial port device. Can be overridden using the
&lsquo;<samp>-P</samp>&rsquo; option.
</p>
</dd>
<dt> <code>default_linuxgpio = &quot;<var>default-linuxgpio-device</var>&quot;;</code></dt>
<dd><a name="index-default_005flinuxgpio"></a>
<p>Assign the default gpiochip for linuxgpio&rsquo;s libgpiod mode,
e.g. &quot;gpiochip0&quot;. Ignored for linuxgpio&rsquo;s sysfs mode. Can be overridden
using the &lsquo;<samp>-P</samp>&rsquo; option.
</p>
</dd>
<dt> <code>default_programmer = &quot;<var>default-programmer-id</var>&quot;;</code></dt>
<dd><a name="index-default_005fprogrammer"></a>
<p>Assign the default programmer id. Can be overridden using the &lsquo;<samp>-c</samp>&rsquo;
option.
</p>
</dd>
<dt> <code>default_baudrate = &quot;<var>default-baudrate</var>&quot;;</code></dt>
<dd><p>Assign the default baudrate value that will be used if the programmer doesn&rsquo;t
provide its specific <code>baudrate</code> entry. Can be overridden using the &lsquo;<samp>-b</samp>&rsquo;
option.
</p>
</dd>
<dt> <code>default_bitclock = &quot;<var>default-bitclock</var>&quot;;</code></dt>
<dd><a name="index-default_005fbitclock"></a>
<p>Assign the default bitclock value. Can be overridden using the &lsquo;<samp>-B</samp>&rsquo;
option.
</p>
</dd>
<dt> <code>allow_subshells = <var>no</var>;</code></dt>
<dd><a name="index-allow_005fsubshells"></a>
<p>Whether or not AVRDUDE&rsquo;s interactive terminal is allowed to use subshell
<code>!</code> commands. This defaults to no for security reasons, e.g., in the
rare case <code>avrdude -t</code> is set up with attached hardware to provide a
web service, remote ssh or a login on a PC instead of a shell, say, for
demo or training purposes. In almost all other cases this can be
overridden in the per-user <code>avrddude.rc</code> or <code>.avrduderc</code>
configuration file with <var>yes</var>.
</p>
</dd>
</dl>
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