Download Beginning Portable Shell Scripting: From Novice to by Peter Seebach PDF

By Peter Seebach

ISBN-10: 1430210435

ISBN-13: 9781430210436

This publication introduces an essential new point of shell scripting to the massive 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 extensive consumer base. This booklet, addressing a large know-how base, is determined to develop into the fashionable shell scripting reference.

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

Example text

Thus, this doesn’t work: $ name=John Smith sh: Smith: command not found $ echo hello, $name hello, 10436ch01final 14 10/23/08 11:37:28 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 15 A brief explanation of what went wrong follows in the next section; a full explanation of what went wrong is found in Chapter 3. For now, the key lesson is that the assignment doesn’t work, and you need a way to prevent the shell from splitting words. Introducing Quoting The separation of input into words is generally very useful, but it is occasionally desirable to prevent it.

The two s­ ingle-­quoted strings are adjacent to a ­double-­quoted string containing only an apostrophe; when the quotes are removed, these become a single shell word. The echo command receives only one argument. As this example illustrates, there are a great number of subtleties to the interactions of these features, but this quick tour should prepare you to follow along with code even if you haven’t used any of these features before. The printf Command The printf command was introduced some years back, but many users are unaware of it.

It saves you time porting, it saves you time debugging, and it generally saves you time even during initial development. If you are sharing source with other users or developers, clean code will get more contributions and more useful feedback. If you are prototyping and revising your design as you go, clean code will be easier to maintain and update. Of the code I wrote ten and 15 years ago, the clean code has stayed with me and adapted quickly to new systems; the badly written code has not survived and has often been too much work to update.

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