• Author: Wikibooks, the open-content textbooks collection
• Format: HTML
• Price: free

This reference is written for a semi-knowledgable UNIX user who has just come up against a problem and has been advised to use awk to solve it. Perhaps one of the examples can be quickly modified for immediate use.

The book is a work in progress, and there may be incomplete or missing chapters.

Chapters include:

• Getting started with awk
• Preface
• Which version
• For More Info
• References
• Introduction
• Some basics
• Some Samples
• Using regular expressions
• Booleans
• Start and End
• Begin and End
• Awk variables
• Awk Arrays
• Punctuation guide
• And now for a grand example:

http://en.wikibooks.org/wiki/AWK

• Author: Wikibooks, the open-content textbooks collection
• Format: HTML
• Price: free

Awk has two faces: it is a utility for performing simple text-processing tasks, and it is a programming language for performing complex text-processing tasks. Awk is useful for simple, quick-and-dirty computational programming. Anybody who can write a BASIC program can use Awk, although Awk’s syntax is different from that of BASIC. Anybody who can write a C program can use Awk with little difficulty, and those who would like to learn C may find Awk a useful stepping stone, with the caution that Awk and C have significant differences beyond their many similarities.

The book is a work in progress, and there may be incomplete or missing chapters.

Chapters include:

• Awk Overview
• Awk Command-Line Examples
• Awk Program Example
• Awk Invocation and Operation
• Search Patterns (1)
• Search Patterns (2)
• Numbers and Strings
• Variables
• Arrays
• Operations
• Standard Functions
• Control Structures
• Output with print and printf
• A Digression: The sprintf Function
• Output Redirection and Pipes
• Using Awk from the Command Line
• Awk Program Files
• A Note on Awk in Shell Scripts
• Nawk
• Awk Quick Reference Guide

http://en.wikibooks.org/wiki/An_Awk_Primer