grep Pocket Reference: A Quick Pocket Reference for a Utility Every Unix User Needs (Pocket Reference (O'Reilly))

✍ Scribed by John Bambenek, Agnieszka Klus

• Publisher: O'Reilly Media
• Year: 2009
• Tongue: English
• Leaves: 84
• Edition: 1
• Category: Library

✦ Synopsis

grep Pocket Reference is the first guide devoted to grep, the powerful Unix content-location utility. This handy book is ideal for system administrators, security professionals, developers, and others who want to learn more about grep and take new approaches with it -- for everything from mail filtering and system log management to malware analysis. With grep Pocket Reference, you will:

• Learn methods for filtering large files for specific content
• Acquire information not included in the current grep documentation
• Get several tricks for using variants such as egrep
• Keep key information about grep right at your fingertips

Find the answers you need about grep quickly and easily. If you're familiar with this utility, grep Pocket Reference will help you refresh your basic knowledge, understand rare situations, and work more efficiently. If you're new to grep, this book is the best way to get started.

✦ Table of Contents

Table of Contents
Chapter 1. grep Pocket Reference
Introduction
Conventions Used in This Book
Using Code Examples
Safari® Books Online
Comments and Questions
Acknowledgments
From John Bambenek
From Agnieszka Klus
Conceptual Overview
Introduction to Regular Expressions
Quotation Marks and Regular Expressions
Metacharacters
POSIX Character Classes
Crafting a Regular Expression
grep Basics
Basic Regular Expressions (grep or grep -G)
Match Control
General Output Control
Output Line Prefix Control
Context Line Control
File and Directory Selection
Other Options
Extended Regular Expressions (egrep or grep -E)
Fixed Strings (fgrep or grep -F)
Perl-Style Regular Expressions (grep -P)
Character Types
Octal Searching
Character Properties
PCRE Options
Introduction to grep-Relevant Environment Variables
Choosing Between grep Types and Performance Considerations
When to Use grep -E
When to Use grep -F
When to Use grep -P
Performance Implications
Advanced Tips and Tricks with grep
Backreferences
Binary File Searching
Useful Recipes
IP addresses
MAC addresses
Email addresses
U.S.-based phone numbers
Social Security numbers
Credit card numbers
Copyright-protected or confidential material
Searching through large numbers of files
Matching strings across multiple lines
References
Index