Table of Contents FOREWORD ACKNOWLEDGMENTS INTRODUCTION Wicked Cool Ruby Scripts You Need Ruby Basics Documentation Organization and Approach The Website 1. GENERAL PURPOSE UTILITIES Check for Changed Files Check for Changed Files The Code Running the Code The Results How It Works Hacking the Script Encrypt a File Encrypt a File The Code Running the Code The Results How It Works Hacking the Script Decrypt a File Decrypt a File The Code Running the Code The Results How It Works File Splitting File Splitting The Code Running the Code The Results How It Works Hacking the Script File Joining File Joining The Code Running the Code The Results How It Works Hacking the Script Windows Process Viewer Windows Process Viewer The Code Running the Code The Results How It Works Hacking the Script File Compressor File Compressor The Code Running the Code The Results How It Works File Decompression File Decompression The Code Running the Code The Results How It Works Mortgage Calculator Mortgage Calculator The Code Running the Code The Results How It Works Hacking the Script 2. WEBSITE SCRIPTING Web Page Link Validator Web Page Link Validator The Code Running the Code The Results How It Works Hacking the Script Orphan File Checker Orphan File Checker The Code Running the Script The Results How It Works Form Generator Form Generator The Code Running the Code The Results How It Works Hacking the Script RSS Parsing RSS Parsing The Code Running the Code The Results How It Works Hacking the Script Stock Exchange Grep Stock Exchange Grep The Code Running the Code The Results How It Works Hacking the Script IP Address Generation IP Address Generation The Code Running the Code The Results How It Works Subnet Calculator Subnet Calculator The Code Running the Code The Results How It Works Hacking the Script 3. LI(U)NIX SYSTEM ADMINISTRATION Fixing Bad Filenames Fixing Bad Filenames The Code Running the Code The Results How It Works Hacking the Script Adding a User Adding a User The Code Running the Code The Results How It Works Hacking the Script Modifying a User Modifying a User The Code Running the Code The Results How It Works Hacking the Script Killing a Stuck Process Killing a Stuck Process The Code Running the Code The Results How It Works Validating Symlinks Validating Symlinks The Code Running the Code The Results How It Works Hacking the Script 4. PICTURE UTILITIES Mass Editing Mass Editing The Code Running the Code The Results How It Works Image Information Extraction Image Information Extraction The Code Running the Code The Results How It Works Hacking the Script Creating a Thumbnail Creating a Thumbnail The Code Running the Code The Results How It Works Hacking the Script Resize a Picture Resize a Picture The Code Running the Code The Results How It Works Hacking the Script Adding a Watermark to Pictures Adding a Watermark to Pictures The Code Running the Code The Results How It Works Convert to Black and White Convert to Black and White The Code Running the Code The Results How It Works Creating a Photo Gallery Creating a Photo Gallery The Code Running the Code Results How It Works Hacking the Script 5. GAMES AND LEARNING TOOLS Sudoku Solver Sudoku Solver The Code Running the Code The Results How It Works Flash Cards Flash Cards The Code Running the Code The Results How It Works Hacking the Script Number-Guessing Game Number-Guessing Game The Code Running the Code The Results How It Works Rock, Paper, Scissors Rock, Paper, Scissors The Code Running the Code The Results How It Works Hacking the Script Word Scramble Word Scramble The Code Running the Code The Results How It Works Hangman Hangman The Code Running the Code The Results How It Works Pig Pig The Code Running the Code The Results How It Works Hacking the Script 6. STRING UTILITIES PDF Generator PDF Generator The Code Running the Code The Results How It Works Word Frequency Word Frequency The Code Running the Code The Results How It Works Hacking the Script Comma-Separated Value Parser Comma-Separated Value Parser The Code Running the Code The Results How It Works Hacking the Script CSV to XML CSV to XML The Code Running the Code The Results How It Works Hacking the Script Ruby Grep Ruby Grep The Code Running the Code The Results How It Works Hacking the Script Password Check Password Check The Code Running the Code The Results How It Works Hacking the Script 7. SERVERS AND SCRAPERS Define Define The Code Running the Code The Results How It Works Hacking the Script Automated SMS Automated SMS The Code Running the Code The Results How It Works Link Scrape Link Scrape The Code Running the Code The Results How It Works Hacking the Script Image Scrape Image Scrape The Code Running the Code The Results How It Works Hacking the Script Scraper Scraper The Code Running the Code The Results How It Works Encrypted Client Encrypted Client The Code Running the Code The Results How It Works Encrypted Server Encrypted Server The Code Running the Code The Results How It Works 8. ARGUMENTS AND DOCUMENTATION File Security File Security The Code Running the Code The Results How It Works Web Scraper Web Scraper The Code Running the Code The Results How It Works Photo Utilities Photo Utilities The Code Running the Code The Results How It Works Conclusion 9. SORTING ALGORITHMS Bubble Sort Bubble Sort The Code Running the Code The Results How It Works Selection Sort Selection Sort The Code Running the Code The Results How It Works Shell Sort Shell Sort The Code Running the Code The Results How It Works Merge Sort Merge Sort The Code Running the Code The Results How It Works Heap Sort Heap Sort The Code Running the Code The Results How It Works Quick Sort Quick Sort The Code Running the Code The Results How It Works Shear Sort Shear Sort The Code Running the Code The Results How It Works A Note About Efficiencies 10. WRITING A METASPLOIT 3.1 MODULE WITH RUBY Introduction to Metasploit Installation Writing a Module Building the Exploit Watching in Real Time Explanation of Metasploit Module Shell Finding the Payload Space A. AFTERWORD Wicked Cool Ruby Scripts Useful Scripts that Solve Difficult Problems Steve Pugh Editor William Pollock Copyright © 2009 For information on book distributors or translations, please contact No Starch Press, Inc. directly: No Starch Press, Inc. 555 De Haro Street, Suite 250, San Francisco, CA 94107 phone: 415.863.9900; fax: 415.863.9950; [email protected]; www.nostarch.com Library of Congress Cataloging-in-Publication Data: Pugh, Steve. Wicked cool Ruby scripts : useful scripts that solve difficult problems / Steve Pugh. p. cm. -- (Wicked cool ...) Includes index. ISBN-13: 978-1-59327-182-4 ISBN-10: 1-59327-182-4 1. Macro instructions (Electronic computers) 2. Computers--Access control--Passwords. I. Title. QA76.7.P84 2008 005.13'3--dc22 2008042965 No Starch Press and the No Starch Press logo are registered trademarks of No Starch Press, Inc. Other product and company names mentioned herein may be the trademarks of their respective owners. Rather than use a trademark symbol with every occurrence of a trademarked name, we are using the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The information in this book is distributed on an "As Is" basis, without warranty. While every precaution has been taken in the preparation of this work, neither the author nor No Starch Press, Inc. shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the information contained in it. No Starch Press Dedication To my loving wife. You're a true gem!