Shell Programming QuickStart

Source: www.phptr.com
Topic: Shell Programming

Short Desciption:
Shell Programming. QuickStart. 2.1 Taking a Peek at Shell Scripts ... Chapter 2 Shell Programming QuickStart. Before Getting Started. ...

 

Content Inside:
Shell Programming QuickStartPage 133chapter2 Shell Programming QuickStart2.1 Taking a Peek at Shell Scripts If you read write or maintain programs the following samples will give you a quickoverview of the construction and style of a shell script and introduce you to some of theconstructs 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 howto write scripts you may want to return to this chapter for a quick reference to refreshyour memory.The C shell and TC shell emulate the C language syntax whereas the Bourne shell isbased on an older programming language called Algol.The Bash and Korn shells tend to be a combination of both the Bourne and C shellsalthough these shells originated from the Bourne shell.To illustrate the differences in the shells four sample programs are provided one foreach shell (the C and TC shells are presented together here). Above each program a listof basic constructs are described for the shell being examined.2.2 Sample Scripts: Comparing the Major ShellsAt the end of each section pertaining to a specific shell you will find a small program toillustrate how to write a complete script. At first glance the programs for each shell lookvery 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. Adetailed comparison of differences among the C/TC Bourne Bash and Korn shells isfound in Appendix B.Quigley.book Wednesday August 25 2004 11:52 AMPage 234Chapter 2 Shell Programming QuickStartBefore Getting Started. You must have a good handle on UNIX/Linux commands.If you do not know the basic commands you cannot do much with shell programming.The next three chapters will teach you how to use some of the major UNIX/Linux commands and Appendix A in ...

 

 

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