ch can be specified multiple times,
to another command.</p>
</dd>
<dt class="hdlist1"><code>OPT_CMDMODE(short, long, &amp;int_var, description, enum_val)</code></dt>
<dd>
<p>Define an "operation mode" option, only one of which in the same
group of "operating mode" options that share the same <code>int_var</code>
can be given by the user. <code>enum_val</code> is set to <code>int_var</code> when the
option is used, but an error is reported if other "operating mode"
option has already set its value to the sam