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

By Peter Seebach

Portable shell scripting is this present day the way forward for smooth Linux, OS X, and Unix command–line entry. Beginning moveable Shell Scripting: From beginner to Professional teaches shell scripting through the use of the typical middle of such a lot shells and expands these rules to all of scripting.

You will find out about transportable scripting and the way to exploit an analogous syntax and layout rules for all shells. You’ll realize in regards to the interplay among shells and different scripting languages like Ruby and Python, and every little thing you examine can be proven in context for Linux, OS X, bash, and AppleScript.

What you’ll learn

This booklet will best you on not only shell scripting, but in addition the trendy context of transportable shell scripting. you'll learn

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

Who is that this e-book for?

This booklet 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 data you must land that the most important entry–level task. those books will educate you a customary and critical expertise from the floor up simply because they're explicitly designed to take you from “novice to professional.” You’ll commence your trip by means of seeing what you must know—but with out unnecessary thought and filler. You’ll construct your ability set via studying easy methods to prepare real–world tasks step-by-step. So no matter if your target 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 surprising territory!

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The other thing printf does is interpret backslashes followed by special characters; these combinations are called escape sequences. The most 10436ch01final 18 10/23/08 11:37:29 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 19 important one to know about is \n, which represents a new line. " Hello! Goodbye! $ In fact, even the shell’s prompt can end up on the same line as the output from a printf command. This can be a bit of a surprise to new users, and even experienced users will get it wrong occasionally.

The other thing printf does is interpret backslashes followed by special characters; these combinations are called escape sequences. The most 10436ch01final 18 10/23/08 11:37:29 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 19 important one to know about is \n, which represents a new line. " Hello! Goodbye! $ In fact, even the shell’s prompt can end up on the same line as the output from a printf command. This can be a bit of a surprise to new users, and even experienced users will get it wrong occasionally.

One character from a class Anything else Itself Using Shell Patterns Shell patterns are quite powerful, but they have a number of limitations. There is no way to specify repetition of a character class; no shell pattern matches an arbitrary number of digits. You can’t make part of a pattern optional; the closest you get to optional components is the asterisk. Patterns as a whole generally match as much as they can; this is called being greedy. However, if matching too many things with an asterisk prevents a match, the asterisk gives up the extra characters and lets other pattern components match them.

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