Perl by Example with Cdrom

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The grand-daddy of all Perl guides-now updated for Perl on all key platforms.


  • All new edition of the classic hands-on guide to Perl

  • Extensive new coverage of CGI for Web development

  • Now with full cross-platform coverage, including Linux, UNIX, Windows NT, and Macintosh

  • Packed with examples, all on ...
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Overview

The grand-daddy of all Perl guides-now updated for Perl on all key platforms.


  • All new edition of the classic hands-on guide to Perl

  • Extensive new coverage of CGI for Web development

  • Now with full cross-platform coverage, including Linux, UNIX, Windows NT, and Macintosh

  • Packed with examples, all on the enclosed CD-ROM, along with up-to-date Perl software for Windows users

  • Best-selling author Ellie Quigley is Silicon Valley's leading Perl instructor!

The Perl tutorial and reference that started it all is now available in a thoroughly revised edition that covers all flavors of Perl and all system and Web applications. Best-selling author Ellie Quigley combines her deep background and UNIX chops with up-to-the-minute experience teaching Perl and shell programming on all platforms. This translates into hands-on examples that all users can put straight to work whether scripting Web applications or managing networks.

Filled with practical information on Perl development, Perl by Example, Third Edition covers names and operators, regular expressions, file handles, libraries, references, reporting, and more.

Highlights include:


  • Support for Perl on Unix, Linux, Windows, and Macintosh

  • CGI Web development with CGI.pm

  • Database integration with Perl DBI

The user-friendly style offers one-to-one comparisons with other popular languages and utilities and a massive reference section for easy look-up. The hands-on tutorials are great for beginners, but also offer handy refreshers for experienced programmers looking to update their skills.

Aboutthe CD-ROM

The CD-ROM includes all source code from the book, plus new Perl distributions for Windows.

This tutorial/reference is the ideal guide for UNIX professionals who want to (or must) learn Perl (Practical Extraction and Report Language) as quickly as possible. The author teaches Perl through extensive use of thoroughly annotated programming examples, and through comparing and contrasting the features of Perl with those of the UNIX shells and C programming language.

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Product Details

  • ISBN-13: 9780130282514
  • Publisher: Prentice Hall Professional Technical Reference
  • Publication date: 9/28/2001
  • Series: Prentice Hall Open Source Technology Series
  • Edition description: REV
  • Edition number: 3
  • Pages: 880
  • Product dimensions: 7.06 (w) x 9.26 (h) x 1.77 (d)

Meet the Author

Ellie Quigley is the creator of the world's number one interactive Perl course, Perl Multimedia Cyber Classroom, and author of Linux Shells by Example and Unix Shells by Example, Second Edition. Her courses at Sun Microsystems and the University of California at Santa Cruz Extension Program are legendary throughout the Silicon Valley.

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Read an Excerpt

Preface: About the Author


Ellie Quigley is president of Learning Enterprises, LE, a small training/consulting company specializing in teaching UNIX related subjects and writing customized classes for on-site training. The original version of Perl by Example was designed as a Perl Programming class for the University of California, Extension, Santa Cruz, complete with training guide and exercises. Due to the success of the class, this book evolved. She has also authored UNIX Shells by Example, published by Prentice Hall last year. Any comments or questions can be forwarded to Ellie Quigley at Learning Enterprises by e-mail: shellieq@netcom.com.


Acknowledgments


I would like to send a special appreciation to Mark Houser, a system administration instructor for Remedy Corporation. Mark, with an MS in computer science, enjoys "extending his systems beyond the ordinary" with tools like Perl. He has always been there to answer questions, and he donated his taintperl database application in Appendix B. Mark's email address is mark.houser@EBay.Sun.COM.
I also owe a great deal to Deac Lancaster, a true scholar, co-worker, and good friend. While working for Sun Education, Deac spent many an evening after a long teaching day to guide me patiently through the workings of sockets, message queues, and semaphores. He loaned me his demo C programs, and together we re-wrote them in Perl for this book. Deac is now teaching at Remedy Corporation. Thanks, Deac! John Nouveaux, from Nouveaux Consulting, Santa Rosa, California, has also contributed a number of his Perl programs for the Appendix B in this book. John, an expert network programmerand system administrator, is a consultant and a dynamic teacher, specializing in connectivity issues using tcp/ip and the Internet.
Thanks also to Steve Hanson for his system administration work and to George Williams for compiling the CD-ROM and setting up the Web server.
Richard Evans, from Sun Microsystems, volunteered his time to test the examples in this book and offered helpful suggestions on how to improve them. Thank you, Richard.
Of course, appreciation to my editors, Mark Taub and Patti Guerrieri, for teaching me about the book business and patiently awaiting overdue chapters and correction pages. And to Roberta Harvey, from RAH Consulting, for her technical review and valuable criticism.
Thanks to Perl pioneers Larry Wall and Randal L. Schwartz, authors of the following books: Learning Perl by Randal L. Schwartz and Perl Programming by Larry Wall and Randal L. Schwartz.
And last, but not least, a huge thanks to all of my students out there who helped me learn Perl and kept it fun.


Preface


A picture is worth a thousand words, and so is a good example. Perl by Example is organized to teach you Perl from scratch with examples of complete succinct programs. Each line of a script sample is numbered, and important lines are highlighted. The output of the program is then displayed with numbers corresponding to the script numbers. Following the output is a separate explanation for each of the numbered lines. The examples are small and to the point for the topic at hand. Since the backbone of this book was used as a student guide to Perl, the topics are modularized. Each module builds on the previous one with a minimum of forward referencing and a logical progression from one topic to the next.
Perl by Example is not just a beginner's guide, but a complete guide to Perl. It covers many aspects of what Perl can do, from regular expression handling, to formatting reports, to interprocess communication. It will teach you about Perl and, in the process, a lot about UNIX. Although some UNIX knowledge will greatly accelerate your learning path, it is not assumed that you are a guru. Anyone reading, writing, or just maintaining Perl programs can greatly profit from this text. Topics such as networking, system calls, IPC, and CGI are designed to save the time it takes to figure out how the functions work, what libraries are needed, and the correct syntax, etc. Now, in this second edition, Perl5 objects and references have been added, and since Perl is the standard for writing CGI scripts for the Internet, there is a chapter to get you started writing your own dynamic Web pages.
Perl has a rich variety of functions for handling strings, arrays, the system interface, networking, and more. In order to understand how these functions work, background information concerning the how's, why's, and what for's is provided before demonstrating sample programs that function. This eliminates constantly wading through manual pages and other UNIX books to understand what is going on, what the arguments mean, and what the function actually does.
The Appendices contain a complete list of functions and definitions, command line switches, debugging options, special variables, Perl translators and sample scripts, including a fully functional, annotated Perl program using taintperl and interfacing with a database application.
I have been teaching now for the past 30 years and am committed to understanding how people learn. Having taught Perl now for over a year, I find that many new Perlers get frustrated when trying to teach themselves how to program in Perl. I, too, experienced frustration when first tackling Perl. So I wrote a book to help myself learn and to help my students, and now to help you. In my book you will not only learn Perl, you will also save yourself a great deal of time.
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Table of Contents

Preface
Acknowledgments
Ch. 1 The Practical Extraction and Report Language 1
Ch. 2 Perl Scripts 9
Ch. 3 Getting a Handle on Printing 21
Ch. 4 What's In a Name 41
Ch. 5 Where's the Operator? 101
Ch. 6 If Only, Unconditionally, Forever 133
Ch. 7 Regular Expressions - Pattern Matching 163
Ch. 8 Getting Control - Regular Expression Metacharacters 197
Ch. 9 Getting a Handle on Files 249
Ch. 10 How Do Subroutines Function? 289
Ch. 11 Modularize it, package it, and Send it to the Library! 323
Ch. 12 Does this Job Require a Reverence? 355
Ch. 13 Bless Those Things! (Object-Oriented Perl) 379
Ch. 14 Those Magic Ties, DBM Stuff, and the Database Hooks 435
Ch. 15 Introduction to Perl Database Programming 459
Ch. 16 Interfacing with the System 499
Ch. 17 Report Writing with Pictures 583
Ch. 18 Send it Over the Net and Sock it to Em! 599
Ch. 19 CGI and Perl: The Hyper Dynamic Dvo 631
App. A Perl Built-Ins, Pragmas, Modules, and the Debugger 735
App. B Some Helpful Scripts 783
App. C An Object-Oriented Perl/CGI Program 809
App. D HTML Documents: A Basic Introduction 821
Index 839
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Preface

Last week, I was teaching Perl at the UCSC extension in Santa Clara, California to a group of professionals coming from all around the Bay Area. I always ask at the beginning of the class, "and so why do you want to learn Perl?". The responses vary from, "Our company has an auction site on the Web and I'm the webmaster. I need to maintain the CGI programs that process our orders, " or "I work in a genetics research group at Stanford and have to deal with tons of data . . . we're looking for the gene that causes arteriosclerosis . . . oh and I heard that if I learn Perl, I won't have to depend on programmers to do this," or "I work at a local bank and we use Perl to interface with our big Oracle databases," or "I'm a UNIX/NT system administrator and our boss has decided that all future admin scripts should be written in Perl," or "I'm designing a Web page for my wife who wants to do Taro card readings for profit," or "I just got laid off and heard that it's an absolute must to have Perl on my resume." And I am always amazed at the variety of people who show up: engineers, scientists, geneticists, meteorologists, managers, salespeople, programmers, techies, hardware guys, students, stockbrokers, administrators of all kinds, librarians, authors, bankers, artists-you name it. Perl does not exclude anyone. Perl is for everyone and it runs on everything.

No matter who you are, I think you'll agree, a picture is worth a thousand words, and so is a good example. Perl by Example is organized to teach you Perl from scratch with examples of complete succinct programs. Each line of a script example is numbered, and important lines are highlighted in bold. The output ofthe program is then displayed with line numbers corresponding to the script line numbers. Following the output is a separate explanation for each of the numbered lines. The examples are small and to the point for the topic at hand. Since the backbone of this book was used as a student guide to a Perl course, the topics are modularized. Each chapter builds on the previous one with a minimum of forward referencing and a logical progression from one topic to the next. There are exercises at the end of the chapters. You will find all of the examples on the CD at the back of the book. They have been thoroughly tested on a number of major platforms.

Perl by Example is not just a beginner's guide, but a complete guide to Perl. It covers many aspects of what Perl can do, from regular expression handling, to formatting reports, to interprocess communication. It will teach you about Perl and, in the process, a lot about UNIX and Windows. Since Perl was originally written on and for UNIX systems, some UNIX knowledge will greatly accelerate your learning path, but it is not assumed that you are by any means a guru. Anyone reading, writing, or just maintaining Perl programs can greatly profit from this text. Topics such as networking, system calls, IPC, and CGI are designed to save the time it takes to figure out how the functions work, what libraries are needed, the correct syntax, etc. This third edition also covers Perl objects, references, and CGI, as well as a new chapter to show you how to use the popular CGI.pm module by Lincoln Stein.

Perl has a rich variety of functions for handling strings, arrays, the system interface, networking, and more. In order to understand how these functions work, background information concerning the hows, whys, and what fors is provided before demonstrating functional sample programs. This eliminates constantly wading through manual pages and other books to understand what is going on, what the arguments mean, and what the function actually does.

The appendices contain a complete list of functions and definitions, command line switches, special variables, popular modules, the Perl debugger; a fully functional, object-oriented CGI program; some other helpful scripts; and a helpful HTML tutorial.

I have been teaching now for the past 30 years and am committed to understanding how people learn. Having taught Perl now for over eight years, all over the world, I find that many new Perlers get frustrated when trying to teach themselves how to program. I found that most people learn best from succinct little examples and practice. So I wrote a book to help myself learn and to help my students, and now to help you. As Perl has grown, so have my books. This latest third edition, includes information for those using Windows as well as different flavors of UNIX. In my book you will not only learn Perl, you will also save yourself a great deal of time. At least that's what my students and readers have told me. You be the judge.

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  • Anonymous

    Posted October 3, 2002

    Not for beginners

    I was misled by statements like, " Perl by Example is not just a ginner's guide, but a complete guide to Perl". This book is NOT for beginners--I was confused after the first few pages and I have even played with Perl in the past. It jumps from UNIX to windows examples and back--without always letting you know where you are. The book doesn't tell you when to go to/from the book to an example and there are many more examples in the book that are not on the CDrom--and they should be. There were many examples I wanted to try in Chapter 1 but only two were on the CDrom. I'm gonna try a Per for Dummies right away, then come back to this book.

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