Perl Reference

Perl Basics
  Perl Introduction
  Getting Started
  Basic Operators and Control Flow (if, if-else, while and until)
  Understanding Scalar Values (integer, character, floating-point)
  More Perl Operators
  Pattern Matching
  More Control Structures (single-line conditional statements, looping, goto)
  Using Subroutines
  Formatting Output
  Process, String and Mathematical Functions
  Scalar Conversion Functions

Perl Arrays
  Lists and Array Variables
  Associative Arrays (Linked Lists, Structures, Trees)
  List and Array Manipulation Functions (Arrays, Associative Arrays)

Perl Working within the O/S
  Reading and Writing to Files (commandline arguments)
  Working with the Filesystem (opening pipes)

Command-Line Options
  Command-Line Options

System Functions
  System Library Emulation Functions
  Socket-Manipulation Functions
  Unix system V IPC Functions

System Variables
  System Variables

Perl References
  References

Perl Advanced Features
  Object-Oriented Programming
  Miscellaneous Features (require, $#array, __LINE__, delimiters, system commands)
  Perl Debugger

Cheat Sheets
  Complete Perl Cheat Sheet