Learning Perl

Preface. 1. Introduction Questions and Answers What Does "Perl" Stand For? How Can I Get Perl? How Do I Make a Perl Program? A Whirlwind Tour of Perl Exercises. 2. Scalar Data What Is Scalar Data? Numbers Strings Perl's Built-in Warnings Scalar Variables Output with print The if Control Structure Getting User Input The chomp Operator The while Control Structure The undef Value The defined Function Exercises. 3. Lists and Arrays Accessing Elements of an Array Special Array Indices List Literals List Assignment Interpolating Arrays into Strings The foreach Control Structure Perl's Favorite Default: Scalar and List Context in List Context Exercises. 4. Subroutines System and User Functions Defining a Subroutine Invoking a Subroutine Return Values Arguments Private Variables in Subroutines The local Operator Variable-length Parameter Lists Notes on Lexical (my) Variables The use strict Pragma The return Operator Exercises. 5. Hashes What Is a Hash? Hash Element Access Hash Functions Typical Use of a Hash Exercises. 6. I/O Basics Input from Standard Input Input from the Diamond Operator The Invocation Arguments Output to Standard Output Formatted Output with printf Exercises. 7. Concepts of Regular Expressions What Are Regular Expressions? Using Simple Patterns A Pattern Test Program Exercises. 8. More About Regular Expressions Character Classes General Quantifiers Anchors Memory Parentheses Precedence Exercises. 9. Using Regular Expressions Matches with m// Option Modifiers The Binding Operator, =~ Interpolating into Patterns The Match Variables Substitutions with s/// The split Operator The join Function Exercises. 10. More Control Structures The unless Control Structure The until Control Structure Expression Modifiers The Naked Block Control Structure The elsif Clause Autoincrement and Autodecrement The for Control Structure Loop Controls Logical Operators Exercise. 11. Filehandles and File Tests What Is a Filehandle? Opening a Filehandle Fatal Errors with die Using Filehandles Reopening a Standard Filehandle File Tests Exercises. 12. Directory Operations Moving Around the Directory Tree Globbing An Alternate Syntax for Globbing Directory Handles Recursive Directory Listing Exercises. 13. Manipulating Files and Directories Removing Files Renaming Files Links and Files Making and Removing Directories Modifying Permissions Changing Ownership Changing Timestamps Using Simple Modules Exercises. 14. Process Management The system Function The exec Function The Environment Variables Using Backquotes to Capture Output Processes as Filehandles Getting Down and Dirty with Fork Sending and Receiving Signals Exercises. 15. Strings and Sorting Finding a Substring with index Manipulating a Substring with substr Formatting Data with sprintf Advanced Sorting Exercises. 16. Simple Databases DBM Files and DBM Hashes Manipulating Data with pack and unpack Fixed-length Random-access Databases Variable-length (Text) Databases Exercises. 17. Some Advanced Perl Techniques Trapping Errors with eval Picking Items from a List with grep Transforming Items from a List with map Unquoted Hash Keys More Powerful Regular Expressions Slices Exercise. A. Exercise Answers. B. Beyond the Llama. Index