"code"><span class="constructor">Rest</span></code>
    keyword takes the remaining of the command line as arguments.
    Every other keyword takes the following word on the command line
    as argument.
    Arguments not preceded by a keyword are called anonymous arguments.
</p><p>

   Examples (<code class="code">cmd</code> is assumed to be the command name):</p><ul>
<li>  <code class="code">cmd -flag           </code>(a unit option)</li>
<li>  <code class="code">cmd -int 1          </code>(an int option 