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33 chapter 2 Shell Programming QuickStart 2.1Taking a Peek at Shell Scripts If you read, write, or maintain programs, the following samples will give you a quick overview of the ...

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33 chapter 2 Shell Programming QuickStart 2.1Taking a Peek at Shell Scripts If you read, write, or maintain programs, the following samples will give you a quick overview of the construction and style of a shell script and introduce you to some of the constructs and syntax found in these programs. Note: If you are not familiar with programming,           skip this chapter and go to Chapter 3. When you have finished learning how to write scripts, you may want to return to this chapter for a quick reference to refresh your memory. The C shell and TC shell emulate the C language syntax whereas the Bourne shell is based on an older programming language called Algol. The Bash and Korn shells tend to be a combination of both the Bourne and C shells, although these shells originated from the Bourne shell. To illustrate the differences in the shells, four sample programs are provided, one for each shell (the C and TC shells are presented together here). Above each program, a list of basic constructs are described for the shell being examined. 2.2Sample Scripts: Comparing the Major Shells At the end of each section pertaining to a specific shell, you will find a small program to illustrate how to write a complete script. At first glance, the programs for each shell look very similar. They are. And they all do the same thing. The main difference is the syntax. After you have worked with these shells for some time, you will quickly adapt to the differences          and start formulating your own opinions about which shell is your favorite. A detailed comparison of differences among the C/TC, Bourne, Bash, and Korn shells is found in Appendix B. Quigley.book    Wednesday, August 25, 2004  11:52 AM 34 Chapter 2 Shell Programming QuickStart Before Getting Started. You must have a good handle on UNIX/Linux commands. I ...

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