Apress - Pro Bash Programming Scripting the GNULinux Shell (10-2009) (ATTiCA).pdf - INFORMATYKA - Rince

THE EXPERT’S VOICE ® IN LINUX

Covering

Bash 4.0

Bash

Programming

Scripting the GNU/Linux Shell

Programming bash from one-liners

to professional programs

Chris F.A. Johnson

Pro

BOOKS FOR PROFESSIONALS BY PROFESSIONALS ®

Pro Bash Programming:

Scripting the GNU/Linux Shell

Dear Reader,

Author of

Shell Scripting Recipes:

A Problem-Solution

Approach

The shell is a programming language! A shell script is as much a program as

anything written in C, Python, or any other programming language. Just

because shell scripts are easier to write doesn’t mean they should take a back-

seat to compiled programs or other scripting languages.

I wrote Pro Bash Programming to present a tutorial that introduces the shell,

and bash specifically, as a programming language. If you need a program to

accomplish a task on GNU/Linux or any other Unix-type system, I want you

to consider the shell before any other language. If you write a prototype for a

program using the shell, I want you to realize that you don’t need to translate it

to another language.

This book will give you a grounding in programming techniques used in

writing shell programs no matter what your past programming experience. If

you’ve never written a computer program before, Pro Bash Programming will

get you started and help you become a proficient shell programmer. If you

have written a few shell programs, this book will take you to the next level and

beyond. It will enable you to do things with the shell you never thought it could

do. If you are already an expert shell programmer, this book will provide insight

into the advanced shell programming, helping you write more, and more effi-

cient, scripts.

Bash is the shell of the Free Software Foundation’s GNU project and is the

standard shell on almost all Linux distributions. It is the shell you probably

use at the command line. It offers programmers many enhancements over the

standard Unix shell. You will find bash on many versions of Unix. It may not be

the default shell, but it is usually available for interpreting your scripts.

I hope this book will help you become a more productive programmer and

that your programs will be written using the Bash shell.

Companion eBook

Chris F.A. Johnson

THE APRESS ROADMAP

See last page for details

on $10 eBook version

Beginning Perl 2nd Edition

Expert Shell

Scripting

Beginning the

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Beginning Ubuntu LTS Server

Administration 2nd Edition

Pro Bash

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SOURCE CODE ONLINE

Beginning Portable Shell Scripting

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Administration Recipes

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ISBN 978-1-4302-1997-2

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9 781430 219972

■ CONTENTS

Pro Bash Programming

Scripting the GNU/Linux Shell

■

Chris F.A. Johnson

■ CONENTS

Pro Bash Programming: Scripting the GNU/Linux Shell

2009 by Chris F.A. Johnson

electronic or mechanical, including photocopying, recording, or by any information storage or retrieval

system, without the prior written permission of the copyright owner and the publisher.

ISBN-13 (pbk): 978-1-4302-1997-2

ISBN-13 (electronic): 978-1-4302-1998-9

Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1

Trademarked names may appear in this book. Rather than use a trademark symbol with every

occurrence of a trademarked name, we use the names only in an editorial fashion and to the benefit of

the trademark owner, with no intention of infringement of the trademark.

Lead Editor: Frank Pohlmann

Technical Reviewer: Ed Schaefer

Editorial Board: Clay Andres, Steve Anglin, Mark Beckner, Ewan Buckingham, Tony Campbell,

Gary Cornell, Jonathan Gennick, Jonathan Hassell, Michelle Lowman, Matthew Moodie,

Jeffrey Pepper, Frank Pohlmann, Douglas Pundick, Ben Renow-Clarke, Dominic Shakeshaft,

Matt Wade, Tom Welsh

Project Manager: Kylie Johnston

Copy Editor: Kim Wimpsett

Compositor: ContentWorks, Inc.

Indexer: Julie Grady

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For information on translations, please contact Apress directly at 233 Spring Street, New York, NY 10013.

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precaution has been taken in the preparation of this work, neither the author(s) nor Apress shall have

any liability to any person or entity with respect to any loss or damage caused or alleged to be caused

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“

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The source code for this book is available to readers at

http://www.apress.com .

The information in this book is distributed on an

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