Picking Up Perl 0.12

Picking Up Perl Copyright © 1998, 1999, 2001 Bradley M. Kuhn.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with Invariant Sections being "The GNU Free Documentation License", with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License" (see GNU Free Documentation License).

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• Preface:
• Getting Started:
• Working with Scalars:
• Arrays:
• Control Structures:
• Associative Arrays (Hashes):
• Regular Expressions:
• Subroutines:
• Background of Perl:
• GNU Free Documentation License:
• General Index:

  --- The Detailed Node Listing ---

  Preface

• Purpose of this Book:
• Acknowledgments:
• Obtaining the Most Recent Version:
• Audience: Who should read this book?
• Material Covered: What does this book cover?
• Conventions Used in this Book: How do I read this book?

  Getting Started

• A First Perl Program:
• Expressions:

  Working with Scalars

• Strings:
• Numbers:
• Scalar Variables:
• Operators:
• Output of Scalar Data:
• Special Variables:
• Summary of Scalar Operators:

  Strings

• Single-quoted Strings:
• A Digression---The print Function:
• Double-quoted Strings:

  Single-quoted Strings

• Special Characters in Single-quoted Strings:
• Newlines in Single-quoted Strings:
• Examples of Invalid Single-quoted Strings:

  Double-quoted Strings

• Interpolation in Double-quoted Strings:
• Examples of Interpolation:
• Examples of Interpolation (ASCII Octal Values):
• Examples of Interpolation (ASCII Hex Values):
• Characters Requiring Special Consideration:

  Numbers

• Numeric Literals:

  Numeric Literals

• Printing Numeric Literals: Using print with numeric literals

  Scalar Variables

• Scalar Interpolation: Expanding scalar variables in double-quoted strings
• Undefined Variables: Before a Variable has a value, It is undefined

  Operators

• Numerical Operators: Operators for numeric scalars
• Comparison Operators: Operators to compare scalars with each other
• Auto-Increment and Decrement:
• String Operators: Operators for string scalars

  Arrays

• The Semantics of Arrays:
• List Literals:
• Array Variables:
• Manipulating Arrays and Lists:

  Array Variables

• Using Array Variables:
• Associated Scalars:

  Manipulating Arrays and Lists

• It Slices!:
• Functions:
• The Context (List vs. Scalar):
• Array Interpolation:

  Functions

• Arrays as Stacks:
• Arrays as Queues:

  Control Structures

• Blocks:
• A Digression---Truth Values:
• The if/unless Structures:
• The while/until Structures:
• The do while/until Structures:
• The for Structure:
• The foreach Structure:

  Associative Arrays (Hashes)

• What Is It?:
• Hash Variables:
• Hash Literals:
• Hash Functions:
• Slices:
• Context Considerations:

  Functions

• Keys and Values:
• Each:

  Regular Expressions

• The Theory Behind It All:
• The Simple:
• Pattern Matching:
• Regular Expression Shortcuts:

  The Simple

• Simple Characters:
• The * Special Character:
• The . Character:
• The | Character:
• Grouping with ()s:
• The Anchor Characters:

  Subroutines

• Defining Subroutines:
• Returning Values:
• Using Arguments:

  Background of Perl

• A Brief History of Perl:
• Perl as a Natural Language:
• The Slogans:

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