e>--example</code>, use <code>NULL</code> to omit),</p>
</li>
<li>
<p><code>int_var</code> is an integer variable,</p>
</li>
<li>
<p><code>str_var</code> is a string variable (<code>char *</code>),</p>
</li>
<li>
<p><code>arg_str</code> is the string that is shown as argument
(e.g. <code>"branch"</code> will result in <code>&lt;branch&gt;</code>).
If set to <code>NULL</code>, three dots (<code>...</code>) will be displayed.</p>
</li>
<li>
<p><code>description</code> is a short string to describe the effect 