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

By Peter Seebach

This booklet introduces an essential new element 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 right here addresses the fashionable factor of portability to this wide purchaser base. This booklet, addressing a large know-how base, is decided to turn into the fashionable shell scripting reference.

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

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N" "$password" Your password is xfzy%dNo. In general, I recommend using s­ ingle-­quoted strings as printf format strings; this ensures that the calling shell will not do something unexpected with any backslash escape sequences you used (behavior of backslashes inside d ­ ouble-­quoted strings is not always 100% portable), and that no parameter substitution occurs; this allows you to be sure you know what your format string is. Some implementations of printf have difficulties with particularly long formats; for example, the Solaris printf aborts when given the format string %05000d.

Do not write carelessly or poorly, even for small ­one-­off scripts. Sloppy work is ­habit-­forming. 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.

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. The quote marks themselves are removed. While this is useful for arguments, it is important not to quote things that you do want the shell to split.

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