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We will be using Bash, an acronym  for "Bourne-Again shell" and a pun on Stephen Bourne's now classic Bourne shell.
Bash has become a de facto standard for shell scripting on most flavors of UNIX. Most of the principles this book covers apply equally well to scripting with other shells, such as the Korn Shell, from which Bash derives some of its features,  and the C Shell and its variants.
Note that C Shell programming is not recommended due to certain inherent problems, as pointed out in an October, Usenet post by Tom Christiansen.
What follows is a tutorial on shell scripting. It relies heavily on examples to illustrate various features of the shell. The example scripts work -- they've been tested, insofar as possible -- and some of them are even useful in real life.
The reader can play with the actual working code of the examples in the source archive scriptname. Should the source archive not be available, then cut-and-paste from the HTML or pdf rendered versions.
Be aware that some of the scripts presented here introduce features before they are explained, and this may require the reader to temporarily skip ahead for enlightenment. Unless otherwise noted, the author of this book wrote the example scripts that follow.
His countenance was bold and bashed not. Starting Off With a Sha-Bang --Larry Wall In the simplest case, a script is nothing more than a list of system commands stored in a file. At the very least, this saves the effort of retyping that particular sequence of commands each time it is invoked.
Example The advantages of placing the commands in a script go far beyond not having to retype them time and again. The script becomes a program -- a tool -- and it can easily be modified or customized for a particular application.
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