format:</p>
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<div class="content">
<pre>&lt;opt-spec&gt;&lt;flags&gt;*&lt;arg-hint&gt;? SP+ help LF</pre>
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<dt class="hdlist1"><code>&lt;opt-spec&gt;</code></dt>
<dd>
<p>its format is the short option character, then the long option name
separated by a comma. Both parts are not required, though at least one
is necessary. May not contain any of the <code>&lt;flags&gt;</code> characters.
<code>h,help</code>, <code>dry-run</co