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Beginning Portable Shell Scripting: From Novice to by Peter Seebach

By Peter Seebach

Portable shell scripting is at the present time the way forward for smooth Linux, OS X, and Unix command–line entry. Beginning transportable Shell Scripting: From beginner to Professional teaches shell scripting through the use of the typical center of so much shells and expands these rules to all of scripting.

You will find out about moveable scripting and the way to take advantage of a similar syntax and layout rules for all shells. You’ll observe concerning the interplay among shells and different scripting languages like Ruby and Python, and every little thing you research could be proven in context for Linux, OS X, bash, and AppleScript.

What you’ll learn

This publication will top you on not only shell scripting, but additionally the trendy context of transportable shell scripting. you are going to learn

  • The center Linux/OS X shell constructs from a portability aspect of view
  • How to jot down scripts that write different scripts, and the way to put in writing macros and debug them
  • How to put in writing and layout shell script portably from the floor up
  • How to take advantage of programmable utilities and their inherent portability on your virtue, whereas pinpointing power traps
  • Pulling every thing jointly, find out how to engineer scripts that play good with Python and Ruby, or even run on embedded systems

Who is that this publication for?

This ebook is for procedure directors, programmers, and testers operating throughout Linux, OS X, and the Unix command line.

About the Apress starting Series

The starting sequence from Apress is the appropriate option to get the knowledge you must land that an important entry–level task. those books will train you a typical and significant know-how from the floor up simply because they're explicitly designed to take you from “novice to professional.” You’ll begin your trip through seeing what you must know—but with out unnecessary thought and filler. You’ll construct your ability set through studying easy methods to prepare real–world initiatives step-by-step. So even if your objective is your subsequent occupation problem or a brand new studying chance, the start sequence from Apress will take you there—it is your depended on consultant via strange territory!

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Extra info for Beginning Portable Shell Scripting: From Novice to Professional

Example text

Sadly, this is not so. Instead, there are some characters in a pattern that have special meaning and can match something other than themselves. Characters that have special meaning in a pattern are called wildcards or metacharacters. Some users prefer to restrict the term wildcard to refer only to the special characters that can match anything. In talking about patterns, I prefer to call them all wildcards to avoid confusion with characters that have special meaning to the shell. Wildcards make those two simple rules much more complicated; a single character in a pattern could match a very long string, or a group of characters in the pattern might match only one character or even none at all.

The following example code illustrates how such a list might be used. ";; esac How do you like them apples? This script has a subtle bug, however. It does not check for exact matches. ";; esac How do you like them apples? 10436ch02final 26 10/23/08 10:13:26 PM C hapter 2 ■ P A T T E R N S A N D R E G U LA R E X P R E S S I O N S 27 The problem is that the asterisks can match anything, even the commas used as delimiters. ";; esac The only fruit for which there is no Cockney slang. The expansion of $list now has a comma appended to each end, ensuring that every member of the list has a comma on both sides of it.

Typos can create horrible problems. o files (created by the C compiler) and end up typing rm *>o. This removes every file (except dot files) in the current directory and redirects its output (which is usually empty) into a file named o. This typo may seem unusual, but the * is a shifted key on most US keyboards and so is >. Just remember: There is no undo button. Whenever you’re about to type an rm command, especially an rm -f, be sure to check the command line out to make sure you haven’t made any crucial typos.

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