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Randal L. Schwartz,
brian d foy &
Tom Phoenix
Learning
Perl
MAKING EASY THINGS EASY AND
HARD THINGS POSSIBLE
7th Edition


Randal L. Schwartz, brian d foy, and Tom Phoenix
Learning Perl
Making Easy ings Easy and
Hard ings Possible
SEVENTH EDITION
Boston Farnham Sebastopol
Tokyo
Beijing Boston Farnham Sebastopol
Tokyo
Beijing

978-1-491-95432-4
[LSI]
Learning Perl
by Randal L. Schwartz, brian d foy, and Tom Phoenix
Copyright © 2017 Randal L. Schwartz, brian foy, and Tom Phoenix. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are
also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/
institutional sales department: 800-998-9938 or corporate@oreilly.com.
Editor: Heather Scherer
Production Editor: Melanie Yarbrough
Copyeditor: Jasmine Kwityn
Proofreader: Sonia Saruba
Indexer: Lucie Haskins
Interior Designer: David Futato
Cover Designer: Karen Montgomery
Illustrator: Rebecca Demarest
October 2016: Seventh Edition
Revision History for the Seventh Edition
2016-10-05: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781491954324 for release details.
The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. Learning Perl, the cover image, and
related trade dress are trademarks of O’Reilly Media, Inc.
While the publisher and the authors have used good faith efforts to ensure that the information and
instructions contained in this work are accurate, the publisher and the authors disclaim all responsibility
for errors or omissions, including without limitation responsibility for damages resulting from the use of
or reliance on this work. Use of the information and instructions contained in this work is at your own
risk. If any code samples or other technology this work contains or describes is subject to open source
licenses or the intellectual property rights of others, it is your responsibility to ensure that your use
thereof complies with such licenses and/or rights.

Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
1.
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Questions and Answers 1
Is This the Right Book for You? 1
What About the Exercises and Their Answers? 2
What If I’m a Perl Course Instructor? 3
What Does “Perl” Stand For? 4
Why Did Larry Create Perl? 4
Why Didn’t Larry Just Use Some Other Language? 4
Is Perl Easy or Hard? 5
How Did Perl Get to Be So Popular? 7
What’s Happening with Perl Now? 7
What’s Perl Really Good For? 7
What Is Perl Not Good For? 8
How Can I Get Perl? 8
What Is CPAN? 9
Is There Any Kind of Support? 9
What If I Find a Bug in Perl? 10
How Do I Make a Perl Program? 10
A Simple Program 11
What’s Inside That Program? 13
How Do I Compile My Perl Program? 15
A Whirlwind Tour of Perl 16
Exercises 17
2.
Scalar Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Numbers 19
iii
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