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Beginning Portable
Shell Scripting
From Novice to Professional
Peter Seebach
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Beginning Portable Shell Scripting: From Novice to Professional
Copyright © 2008 by Peter Seebach
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): 978-1-4302-1043-6
ISBN-10 (pbk): 1-4302-1043-5
ISBN-13 (electronic): 978-1-4302-1044-3
ISBN-10 (electronic): 1-4302-1044-3
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: Gary V. Vaughan
Editorial Board: Clay Andres, Steve Anglin, Ewan Buckingham, Tony Campbell, Gary Cornell,
Jonathan Gennick, Michelle Lowman, Matthew Moodie, Jeffrey Pepper, Frank Pohlmann,
Ben Renow-Clarke, Dominic Shakeshaft, Matt Wade, Tom Welsh
Project Manager: Richard Dal Porto
Copy Editor: Kim Benbow
Associate Production Director: Kari Brooks-Copony
Production Editor: Katie Stence
Compositor: Linda Weidemann, Wolf Creek Press
Proofreader: Dan Shaw
Indexer: Broccoli Information Management
Cover Designer: Kurt Krames
Manufacturing Director: Tom Debolski
Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor,
New York, NY 10013. Phone 1-800-SPRINGER, fax 201-348-4505, e-mail orders-ny@springer-sbm.com,
or visit http://www.springeronline.com.
For information on translations, please contact Apress directly at 2855 Telegraph Avenue, Suite 600,
Berkeley, CA 94705. Phone 510-549-5930, fax 510-549-5939, e-mail info@apress.com, or visit http://www.
apress.com.
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eBook versions and licenses are also available for most titles. For more information, reference our Spe-
cial Bulk Sales–eBook Licensing web page at http://www.apress.com/info/bulksales.
The information in this book is distributed on an “as is” basis, without warranty. Although every pre-
caution 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 directly
or indirectly by the information contained in this work.
The source code for this book is available to readers at http://www.apress.com. You may need to answer
questions pertaining to this book in order to successfully download the code.
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For Nora, who believed.
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v
Contents at a Glance
About the Author .................................................................xv
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Acknowledgments ................................................................xix
CHAPTER 1 Introduction to Shell Scripting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CHAPTER 2 Patterns and Regular Expressions ...............................21
CHAPTER 3 Basic Shell Scripting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
CHAPTER 4 Core Shell Features Explained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
CHAPTER 5 Shells Within Shells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
CHAPTER 6 Invocation and Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
CHAPTER 7 Shell Language Portability .....................................145
CHAPTER 8 Utility Portability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
CHAPTER 9 Bringing It All Together ........................................205
CHAPTER 10 Shell Script Design ............................................219
CHAPTER 11 Mixing and Matching ..........................................237
APPENDIX A The Shell Command Language .................................255
APPENDIX B The sh Utility ..................................................297
APPENDIX C Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
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