><span class="keyword">end</span></code></pre>Parsing of command line arguments.
<p>

   This module provides a general mechanism for extracting options and
   arguments from the command line to the program.
</p><p>

   Syntax of command lines:
    A keyword is a character string starting with a <code class="code">-</code>.
    An option is a keyword alone or followed by an argument.
    The types of keywords are: <code class="code"><span class="constructor">Unit</span></code>, <code class="code"><span clas