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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><HTML><HEAD><TITLE>Introduction</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="Advanced Bash-Scripting Guide"HREF="index.html"><LINKREL="PREVIOUS"TITLE="Advanced Bash-Scripting Guide"HREF="index.html"><LINKREL="NEXT"TITLE="Why Shell Programming?"HREF="why-shell.html"><METAHTTP-EQUIV="Content-Style-Type"CONTENT="text/css"><LINKREL="stylesheet"HREF="common/kde-common.css"TYPE="text/css"><METAHTTP-EQUIV="Content-Type"CONTENT="text/html; charset=iso-8859-1"><METAHTTP-EQUIV="Content-Language"CONTENT="en"><LINKREL="stylesheet"HREF="common/kde-localised.css"TYPE="text/css"TITLE="KDE-English"><LINKREL="stylesheet"HREF="common/kde-default.css"TYPE="text/css"TITLE="KDE-Default"></HEAD><BODYCLASS="PART"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#AA0000"VLINK="#AA0055"ALINK="#AA0000"STYLE="font-family: sans-serif;"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="index.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="why-shell.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="PART"><ANAME="PART1"></A><DIVCLASS="TITLEPAGE"><H1CLASS="TITLE">Part 1. Introduction</H1><DIVCLASS="PARTINTRO"><ANAME="AEN49"></A><P><ANAME="WHATSASCRIPT"></A></P><P>The shell is a command interpreter. More than just the      insulating layer between the operating system kernel and the user,      it's also a fairly powerful programming language.  A shell program,      called a <ICLASS="FIRSTTERM">script</I>, is an easy-to-use tool for      building applications by <SPANCLASS="QUOTE">"gluing"</SPAN> together system      calls, tools, utilities, and compiled binaries.  Virtually the      entire repertoire of UNIX commands, utilities, and tools is      available for invocation by a shell script.  If that were      not enough, internal shell commands, such as testing and loop      constructs, lend additional power and flexibility to scripts.      Shell scripts are especially well suited for administrative      system tasks and other routine repetitive tasks not requiring the      bells and whistles of a full-blown tightly structured programming      language.</P></DIV><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT>1. <AHREF="why-shell.html">Why Shell Programming?</A></DT><DT>2. <AHREF="sha-bang.html">Starting Off With a Sha-Bang</A></DT></DL></DIV></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="index.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="why-shell.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Advanced Bash-Scripting Guide</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top">&nbsp;</TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Why Shell Programming?</TD></TR></TABLE></DIV></BODY></HTML>
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