Chapter 14

Programming

IT administrators will often have to write shell scripts to support the systems that they maintain. This chapter introduces the programming task. For those unfamiliar with programming, this chapter covers more than just shell scripting. First, the chapter reviews the types of programming languages, which were first introduced in Chapter 7. Next, the chapter describes, through numerous examples, the types of programming language instructions found in most programming languages: input and output instructions, assignment statements, selection statements, iteration statements, subroutines. With this introduction, the chapter then turns to scripting in both the Bash interpreter language and DOS, accompanied by numerous examples. ...

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