Learning Perl 2nd Edition by OReilly Media, Tom Christiansen, Randal Schwartz ISBN 9781565922846 156592284X

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ISBN 10: 156592284X
ISBN 13: 9781565922846
Author: OReilly Media, Tom Christiansen, Randal Schwartz

In this update of a bestseller, two leading Perl trainers teach you to use the most universal scripting language in the age of the World Wide Web. With a foreword by Larry Wall, the creator of Perl, this smooth, carefully paced book is the “official” guide for both formal (classroom) and informal learning. It is now current for Perl version 5.004. Learning Perl is a hands-on tutorial designed to get you writing useful Perl scripts as quickly as possible. Exercises (with complete solutions) accompany each chapter. A lengthy new chapter in this edition introduces you to CGI programming, while touching also on the use of library modules, references, and Perl’s object-oriented constructs. Perl is a language for easily manipulating text, files, and processes. It comes standard on most UNIX platforms and is available free of charge on all other important operating systems. Perl technical support is informally available — often within minutes — from a pool of experts who monitor a USENET newsgroup (comp.lang.perl.misc) with tens of thousands of readers. Contents include:

Learning Perl 2nd Edition Table of contents:

Copyright

Foreword

Second Edition Update

Preface

What This Book Is About

Retrieving Exercises

Additional Resources

How to Get Perl

Conventions Used in This Book

Support

Acknowledgments for the First Edition

Acknowledgments for the Second Edition

We’d Like to Hear from You

Introduction

History of Perl

Purpose of Perl

Availability

Basic Concepts

A Stroll Through Perl

Exercise

Scalar Data

What Is Scalar Data?

Numbers

Strings

Scalar Operators

Scalar Variables

Scalar Operators and Functions

as a Scalar Value

Output with print

The Undefined Value

Exercises

Arrays and List Data

What Is a List or Array?

Literal Representation

Variables

Array Operators and Functions

Scalar and List Context

as an Array

Variable Interpolation of Arrays

Exercises

Control Structures

Statement Blocks

The if/unless Statement

The while/until Statement

The for Statement

The foreach Statement

Exercises

Hashes

What Is a Hash?

Hash Variables

Literal Representation of a Hash

Hash Functions

Hash Slices

Exercises

Basic I/O

Input from STDIN

Input from the Diamond Operator

Output to STDOUT

Exercises

Regular Expressions

Concepts About Regular Expressions

Simple Uses of Regular Expressions

Patterns

More on the Matching Operator

Substitutions

The split and join Functions

Exercises

Functions

Defining a User Function

Invoking a User Function

Return Values

Arguments

Private Variables in Functions

Semiprivate Variables Using local

File-Level my( ) Variables

Exercises

Miscellaneous Control Structures

The last Statement

The next Statement

The redo Statement

Labeled Blocks

Expression Modifiers

&& and || as Control Structures

Exercises

Filehandles and File Tests

What Is a Filehandle?

Opening and Closing a Filehandle

A Slight Diversion: die

Using Filehandles

The -x File Tests

The stat and lstat Functions

Exercises

Formats

What Is a Format?

Defining a Format

Invoking a Format

More About the Fieldholders

The Top-of-Page Format

Changing Defaults for Formats

Exercises

Directory Access

Moving Around the Directory Tree

Globbing

Directory Handles

Opening and Closing a Directory Handle

Reading a Directory Handle

Exercises

File and Directory Manipulation

Removing a File

Renaming a File

Creating Alternate Names for a File: Linking

Making and Removing Directories

Modifying Permissions

Modifying Ownership

Modifying Timestamps

Exercises

Process Management

Using system and exec

Using Backquotes

Using Processes as Filehandles

Using fork

Summary of Process Operations

Sending and Receiving Signals

Exercises

Other Data Transformation

Finding a Substring

Extracting and Replacing a Substring

Formatting Data with sprintf( )

Advanced Sorting

Transliteration

Exercises

System Database Access

Getting Password and Group Information

Packing and Unpacking Binary Data

Getting Network Information

Exercise

User Database Manipulation

DBM Databases and DBM Hashes

Opening and Closing DBM Hashes

Using a DBM Hash

Fixed-Length Random Access Databases

Variable-Length ( Text) Databases

Exercises

Converting Other Languages to Perl

Converting awk Programs to Perl

Converting sed Programs to Perl

Converting Shell Programs to Perl

Exercise

CGI Programming

The CGI.pm Module

Your CGI Program in Context

Simplest CGI Program

Passing Parameters via CGI

Less Typing

Form Generation

Other Form Elements

Creating a Guestbook Program

Troubleshooting CGI Programs

Perl and the Web: Beyond CGI Programming

Further Reading

Exercises

Exercise Answers

Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapter 7

Chapter 8

Chapter 9

Chapter 10

Chapter 11

Chapter 12

Chapter 13

Chapter 14

Chapter 15

Chapter 16

Chapter 17

Chapter 18

Chapter 19

Libraries and Modules

Library Terminology

Standard Modules

CPAN: Beyond the Standard Library

Networking Clients

A Simple Client

A Webget Client

An Interactive Client

Further Reading on Networking

Topics We Didn’t Mention

Full Interprocess Communications

The Debugger

The Command Line

Other Operators

Many, Many More Functions

Many, Many Predefined Variables

Symbol Table Manipulation with *FRED

Additional Regular-Expression Features

Packages

Embeddible, Extensible

And Other Stuff

Colophon

Index

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