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AdvAnce PrAise for Perl One-liners “One of the slogans used by Perl is ‘Easy things should be easy and hard things should be possible.’ This book illustrates just how easy things can be— and how much can be done with so little code.” —DaviD Precious, contributor to the Perl Dancer Project anD various cPan moDules “By reading this book you can make a step toward becoming the local computer wizard, even without learning how to program.” —Gabor szabo, founDer anD eDitor of the Perl Weekly newsletter “A set of exercises for deepening your understanding of Perl.” —john D. cook, sinGular value consultinG “The author is enthusiastic about the material and uses an easy writing style. Highly recommended.” —thriG ( jeremy mates), internet Plumber “These one-liners are great. Simple. Clear. Concise.” —jonathan scott Duff, Perl Guru “A quick read full of useful command-line Perl programs.” —chris feDDe, systems enGineer anD Perl enthusiast “Handy for anyone who does a lot of one-off text processing: system administrators, coders, or anyone with large amounts of data they need shifted, filtered, or interpreted.” —jim Davis, Perl DeveloPer
Perl One-liners
Perl One-liners 130 Programs That Get Things Done by Peteris Krumins San Francisco
Perl One-liners. Copyright © 2014 by Peteris Krumins. 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. Printed in USA First printing 17 16 15 14 13 1 2 3 4 5 6 7 8 9 ISBN-10: 1-59327-520-X ISBN-13: 978-1-59327-520-4 Publisher: William Pollock Production Editor: Riley Hoffman Cover Illustration: Tina Salameh Interior Design: Octopod Studios Developmental Editor: William Pollock Technical Reviewer: Alastair McGowan-Douglas Copyeditor: LeeAnn Pickrell Compositor: Riley Hoffman Proofreader: Elaine Merrill For information on distribution, translations, or bulk sales, please contact No Starch Press, Inc. directly: No Starch Press, Inc. 245 8th Street, San Francisco, CA 94103 phone: 415.863.9900; fax: 415.863.9950; info@nostarch.com; www.nostarch.com Library of Congress Cataloging-in-Publication Data Krumins, Peteris. Perl one-liners : 130 programs that get things done / by Peteris Krumins. pages cm Summary: "Snappy Perl programs to streamline tasks and sharpen coding skills"-- Provided by publisher. ISBN 978-1-59327-520-4 (paperback) -- ISBN 1-59327-520-X (paperback) 1. Perl (Computer program language) I. Title. QA76.73.P22K78 2013 005.13'3--dc23 2013030613 No Starch Press and the No Starch Press logo are registered trademarks of No Starch Press, Inc. Other product and company names mentioned herein may be the trademarks of their respective owners. Rather than use a trademark symbol with every occurrence of a trademarked name, we are using the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The information in this book is distributed on an “As Is” basis, without warranty. While every precaution has been taken in the preparation of this work, neither the author nor No Starch Press, Inc. 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 infor- mation contained in it.
About the Author Peteris Krumins is a programmer, systems administrator, blogger, and all-around hacker. He is currently running his own company, Browserling, which focuses on cross-browser testing. He has self-published three books on essential UNIX tools, and he enjoys open-sourcing hundreds of small projects on GitHub. Find his website and blog at http://www.catonmat.net/, follow @pkrumins on Twitter, and see his open source projects at http://github.com/pkrumins/. About the Technical reviewer Alastair McGowan-Douglas lives in Rugby in the UK. He has been a Perl developer since 2008 and is now stuck writing PHP for a living. His favorite pastime at work is writing Perl scripts for internal use to encourage others to embrace the language. Also a JavaScript developer and Git aficionado, his rantings and musings on these various subjects can be found at http://altreus.blogspot.com/.
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