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I decided to write this book for a couple of reasons. One was that Ive now written a couple of books that have to do with incident response and forensic analysis on Windows systems, and I used a lot of Perl in both books. OkayIll come cleanI used nothing but Perl in both books! What Ive seen as a result of this is that many readers want to use the tools, but dont know howthey simply arent familiar with Perl, with interpreted (or scripting) languages in general, and may not be entirely comfortable with running tools at the command line. This book is intended for anyone who has an interest in useful Perl scripting, in particular on the Windows platform, for the purpose of incident response, and forensic analysis, and application monitoring. While a thorough grounding in scripting languages (or in Perl specifically) is not required, it helpful in fully and more completely understanding the material and code presented in this book. This book contains information that is useful to consultants who perform incident response and computer forensics, specifically as those activities pertain to MS Windows systems (Windows 2000, XP, 2003, and some Vista). My hope is that not only will consultants (such as myself) find this material valuable, but so will system administrators, law enforcement officers, and students in undergraduate and graduate programs focusing on computer forensics.

Perl Scripting for Live Response
Using Perl, theres a great deal of information you can retrieve from systems, locally or remotely, as part of troubleshooting or investigating an issue. Perl scripts can be run from a central management point, reaching out to remote systems in order to collect information, or they can be compiled into standalone executables using PAR, PerlApp, or Perl2Exe so that they can be run on systems that do not have ActiveStates Perl distribution (or any other Perl distribution) installed.
Perl Scripting for Computer Forensic Analysis
Perl is an extremely useful and powerful tool for performing computer forensic analysis. While there are applications available that let an examiner access acquired images and perform some modicum of visualization, there are relatively few tools that meet the specific needs of a specific examiner working on a specific case. This is where the use of Perl really shines through and becomes apparent.
Perl Scripting for Application Monitoring
Working with enterprise-level Windows applications requires a great deal of analysis and constant monitoring. Automating the monitoring portion of this effort can save a great deal of time, reduce system downtimes, and improve the reliability of your overall application. By utilizing Perl scripts and integrating them with the application technology, you can easily build a simple monitoring framework that can alert you to current or future application issues.

About the Author
Harlan Carvey developed an interest in computer security while in the military. After leaving active duty, he began working in the area of penetration testing and vulnerability assessments, leading teams of engineers, and developing his own tools to optimize his ability to collect and analyze data. As most clients employed Windows to some degree, Harlan began to see a disparity in knowledge and support for these operating systems, and decided to seize the opportunity and focus on Windows as an area of interest and research. This led him to address topics in incident response and forensic analysis, and to his position as a forensic analyst.
Harlan has been a prolific author and presenter, beginning with the Usenix LISA-NT conference in 2000. He has also presented at Black Hat, DefCon 9, MISTI, and HTCIA/GMU conferences. Harlan has had articles published in the Information Security Bulletin as well as on the SecurityFocus web site, and is the author of Windows Forensics and Incident Recovery.
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Perl, one of the world's most diffuse programming languages, was born out of the need to resolve the creator's dissatisfaction with what were at the time standard data-parsing solutions. Indeed, since the 1.0 release in 1987, Perl has been heralded for its powerful parsing capabilities--features that are further enhanced through the thousands of Perl extensions made available through CPAN (the Comprehensive Perl Archive Network).

This is the third in O’Reilly’s series of landmark Perl tutorials, which started with Learning Perl, the bestselling introduction that taught you the basics of Perl syntax, and Intermediate Perl, which taught you how to create re-usable Perl software. Mastering Perl pulls everything together to show you how to bend Perl to your will. It convey’s Perl’s special models and programming idioms. This book isn’t a collection of clever tricks, but a way of thinking about Perl programming so you can integrate the real-life

problems of debugging, maintenance, configuration, and other tasks you encounter as a working programmer.

The book explains how to:

• Use advanced regular expressions, including global matches, lookarounds, readable regexes, and regex debugging
• Avoid common programing problems with secure programming techniques
• Profile and benchmark Perl to find out where to focus your improvements
• Wrangle Perl code to make it more presentable and readable
• See how Perl keeps track of package variables and how you can use that for some powerful tricks
• Define subroutines on the fly and turn the tables on normal procedural programming.
• Modify and jury rig modules to fix code without editing the original source
• Let your users configure your programs without touching the code
• Learn how you can detect errors Perl do esn’t report, and how to tell users about them
• Let your Perl program talk back to you by using Log4perl
• Store data for later use in another program, a later run of the same program, or to send them over a network
• Write programs as modules to get the benefit of Perl’s distribution and testing tools

Appendices include “brian’s Guide to Solving Any Perl Problem” to improve your troubleshooting skills, as well as suggested reading to continue your Perl education. Mastering Perl starts you on your path to becoming the person with the answers, and, failing that, the person who knows how to find the answers or discover the problem.
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Learning Perl, better known as "the Llama book", starts the programmer on the way to mastery. Written by three prominent members of the Perl community who each have several years of experience teaching Perl around the world, this edition has been updated to account for all the recent changes to the language up to Perl 5.8. Perl is the language for people who want to get work done. It started as a tool for Unix system administrators who needed something powerful for small tasks. Since then, Perl has blossomed into a full-featured programming langu

age used for web programming, database manipulation, XML processing, and system administration--on practically all platforms--while remaining the favorite tool for the small daily tasks it was designed for. You might start using Perl because you need it, but you'll continue to use it because you love it. Informed by their years of success at teaching Perl as consultants, the authors have re-engineered the Llama to better match the pace and scope appropriate for readers getting started with Perl, while retaining the detailed discussion, t

horough examples, and eclectic wit for which the Llama is famous. The book includes new exercises and solutions so you can practice what you've learned while it's still fresh in your mind.

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This Handy Little book o

ffers programmers a complete overview of the syntax and semantics of regular expressions that are at the heart of every text-processing application. Ideal as a quick reference, Regular Expression Pocket Reference covers the regular expression APIs for Perl 5.8, Ruby (including some upcoming 1.9 features), Java, PHP, .NET and C#, Python, vi, JavaScript, and the PC REregular expression libraries.This concise and easy-to-use reference puts a very powerful tool for manipulating text and data right at your fingertips. Composed of a mixture of symbols and text, regular expressions can be an outlet for creativity, for brilliant programming, and for the elegant solution. Regular Expression Pocket Reference offers an introduction to regular expressions, pattern matching, metacharacters, modes and constructs, and then provides separate

sections for each of the language APIs, with complete regex listings including:

• Supported metac haracters for each language API
• Regular expression classes and interfaces for Ruby, Java, .NET, and C#
• Regular expression operators for Perl 5.8
• Regular expression module objects and functions for Python
• Pattern-matching functions for PHP and the vi editor
• Pattern-matching methods and objects for JavaScript
• Unicode Suppo rt for each of the languages

With plenty of examples and other resources, Regular Expression Pocket Reference summarizes the complex rules for performing this critical text-processing function, and presents this often-confusing topic in a friendly and well-organized format. This guide makes an ideal on-the-job companion.

About the Author

Tony Stubblebine is an Internet consultant, entrepreneur, and blogger. He’s also the author of Regular Expression Pocket Reference, former Engineering Director for Odeo.com and former Engineering Lead for O’Reilly Media. He posts regular updates to his blog, StubbleBlog and regularly releases small websites such as Gem Jack, a repository of documentation for Ruby gems, Rate My Da nce Moves, a YouTube mashup, and I Heart Quotes, the Unix fortune program re-imagined for the web
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With a worldwide community of users and more than a million dedicated programmers, Perl has proven to be the most effective language for the latest trends in computing and business. Every programmer must keep up with the latest tools and techniques. This updated version of Advanced Perl Programming from O'Reilly gives you the essential knowledge of the modern Perl programmer. Whatever your current level of Perl expertise, this book will help you push your skills to the next level and become a more accomplished programmer. O'Reilly's most high-level Perl tutorial to date, Advanced Perl Programming, Second Edition teaches you all the complex techniques for production-ready Perl programs. This completely updated guide clearly explains concepts such as introspection, overriding built-ins, extending Perl's object-oriented model, and testing your code for greater stability. Other topics include:

• Complex data structures
• Parsing
• Templating toolkits
• Working with natural language data
• Unicode
• Interaction with C and other languages
  
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