Red Hat® Linux® 7 Unleashed

Chapter 25. Shell Scripting

In This Chapter

• Creating and Executing a Shell Program

• Variables

• Positional Parameters

• Built-In Variables

• Special Characters

• Comparison of Expressions

• Iteration Statements

• Conditional Statements

• Miscellaneous Statements

• Functions

When you enter commands from the command line, you are entering commands one at a time and getting a response from the system. From time to time, you will need to execute more than one command, one after the other, and get the final result. You can do so with a shell program or shell script. A shell program is a series of Linux commands and utilities that have been put into a file by using a text editor. When you execute a shell program, the commands are interpreted and executed by Linux one after ...