Beginning Portable Shell Scripting: From Novice to by Peter Seebach

By Peter Seebach

This e-book introduces a necessary new element of shell scripting to the large variety of directors and builders operating throughout Linux, OS X and Unix command line. whereas there were different shell scripting books, Peter Seebach the following addresses the trendy factor of portability to this huge client base. This ebook, addressing a large expertise base, is decided to develop into the fashionable shell scripting reference.

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Additional info for Beginning Portable Shell Scripting: From Novice to Professional (Expert's Voice in Open Source)

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10436ch01final 10 10/23/08 11:37:27 PM C h a p t e r 1 ■ I N TRO D U C T I O N T O S HE LL S C R I PT I N G 11 What’s in This Book The next section offers a very quick overview of the shell, without going into great detail on the formal syntax or semantics of shell scripting. If you’ve used the shell before, you may be able to skip it and get into the more detailed material in the following chapters. The next chapter gives a detailed look at the various ways in which the shell performs ­pattern-­matching.

Quotes can be single quotes or double quotes; in both cases, the shell does not use distinct left and right quotes, but uses the same quotes on both sides. [On a slightly related note, text surrounded by back quotes (`) is not being quoted; that is one of the syntaxes used for embedding the output of shell commands, much as variables are substituted. ] Most commonly, you simply enclose a string in single quotes (') to prevent the shell from modifying it. Here’s a review of the hello world example, using quoting: $ set -x $ echo 'hello, world' + echo hello, world hello, world $ echo 'hello, world' + echo hello, world hello, world $ echo ' hello, world' + echo hello, world hello, world Single quotes prevent the shell from modifying input, including word splitting.

If the shell is expecting a continuation of previous input, the prompt changes to a ­greater-­than sign (>). In interactive usage, the shell usually shows the output of each command before printing the next prompt. For instance, the following interactive session shows both of these prompts: $ echo 'hello > there' hello there In the preceding example, the shell gives the first prompt ($) and waits for input. The user enters the text echo 'hello. The apostrophe, or single quote, begins a quoted string; in a quoted string, the shell does not break words around spaces or new lines, and the string is 10436ch01final 11 10/23/08 11:37:28 PM 12 Ch apt er 1 ■ INTRODU C T ION T O S HEL L S C R I PT I N G not complete until the other quote is seen (this is explained a bit more in the section “Introducing Quoting” later in this chapter).

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