in with <code>no-</code> can be <em>negated</em> by removing it.
Other long options can be unset (e.g., set string to NULL, set
integer to 0) by prepending <code>no-</code>.</p>
</li>
<li>
<p>Options and non-option arguments can clearly be separated using the <code>--</code>
option, e.g. <code>-a -b --option -- --this-is-a-file</code> indicates that
<code>--this-is-a-file</code> must not be processed as an option.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_steps_to_parse_options">Step