2018-24 A S Lewis. Permission is granted to copy, distribute an/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover-Texts.</h4>
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<h4>Table of Contents</h4>
<ol>
<li><a href="ch01.html">Introduction</a></li>
<li><a href="ch02.html">Your first script</a></li>
<li><a href="ch03.html">Fundamental Concepts</a></li>
<li><a href="ch04.html">I