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The eXperT’s VoiCe ® in linuX
Covering
Bash 4.0
Pro
Bash
Programming
Scripting the GNU/Linux Shell
Programming bash from one-liners
to professional programs
Chris F.A. Johnson
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■ CONTENTS
Pro Bash Programming
Scripting the GNU/Linux Shell
■
■
■
Chris F.A. Johnson
i
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■ CONENTS
Pro Bash Programming: Scripting the GNU/Linux Shell
Copyright © 2009 by Chris F.A. Johnson
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means,
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
Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor,
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The source code for this book is available to readers at http://www.apress.com .
ii
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■ CONTENTS
Contents at a Glance
■
About the Author................................................................................................... xvi
■ About the Technical Reviewer ............................................................................. xvii
■
Introduction .......................................................................................................... xix
■ Chapter 1: Hello, World! Your First Shell Program ..................................................1
■
Chapter 2: Input, Output, and Throughput ...............................................................7
■
Chapter 3: Looping and Branching ........................................................................19
■ Chapter 4: Command-Line Parsing and Expansion...............................................29
■
Chapter 5: Parameters and Variables....................................................................43
■ Chapter 6: Shell Functions.....................................................................................59
■
Chapter 7: String Manipulation..............................................................................67
■
Chapter 8: File Operations and Commands ...........................................................79
■ Chapter 9: Reserved Words and Builtin Commands .............................................97
■
Chapter 10: Writing Bug-Free Scripts and Debugging the Rest..........................113
■
Chapter 11: Programming for the Command Line ..............................................125
■
Chapter 12: Runtime Configuration .....................................................................141
■
Chapter 13: Data Processing ...............................................................................157
■ Chapter 14: Scripting the Screen.........................................................................179
■
Chapter 15: Entry-Level Programming ................................................................191
■ Appendix: Shell Variables ....................................................................................205
■
Index ....................................................................................................................221
iii
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