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grep Pocket Reference (Pocket Reference (O'Reilly)) (Englisch) Taschenbuch – 15. Februar 2009


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Synopsis

"Grep Pocket Reference" is the first guide devoted to grep, the powerful utility program that helps you locate content in any file on a Unix or Linux system. Several applications use grep, from mail filtering and system log management to malware analysis and application development, and there are many other ways to use the utility. This pocket reference is ideal for system administrators, security professionals, developers, and others who want to learn more about grep and take new approaches with it.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; and, 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 find more efficient uses. If you're new to grep, this book is the best way to get started.

Über den Autor und weitere Mitwirkende

John Bambenek is an information security practitioner from Champaign, Illinois. As a graduate from the University of Illinois with a B.A. in Theoretical Astrophysics (emphasis in extragalactic astrophysics) and a minor in Mathematics, he has been employed as a project manager at Cap Gemini Ernst and Young, where he provided consulting services to numerous Fortune 500 firms. He continues to provide his expertise to the SANS Institute by authoring published course materials and exams. He also operates the charitable Tumaini Foundation, which provides funds and other needed resources to Tanzanian schools for AIDS orphans. He is also known for his current work in spyware and botnet technology, and their use concerning identity theft. He is also a volunteer as an incident handler for the Internet Storm Center, and his research has been cited in various media venues such as the New York Times and the Washington Post. Agnieszka Klus was born in Rzeszow, Poland and came here as a child. She lives in the northwest suburb of Chicago, but considers herself a Chicagoan. She is currently trying to get her Masters in Accountancy at the University of Illinois at Urbana-Champaign, and also works as a system administrator at the Coordinated Science Laboratory.

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20 von 20 Kunden fanden die folgende Rezension hilfreich
A very handy reference 8. Februar 2009
Von calvinnme - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
This little book is everything a pocket reference should be. grep and egrep are not hard to use, but there are quite a few valid combinations of options, and this book pretty much covers them all. If you want to find expressions in one or more files, this is the tool to use. It's easy to forget everything available, so this book puts everything in one place for you. There's even a section on an option of grep that is only valid with PERL, so you may or may not have access to it. The following is the table of contents since it is not listed in the product description. One word of warning - if you don't already understand regular expressions this book won't teach it to you. It is indeed just a quick reference for concepts you should already know. The advanced tips and tricks section is the only exception to that rule and is itself worth the price of admission.

Chapter 1. grep Pocket Reference
Section 1.1. Introduction
Section 1.2. Conceptual Overview
Section 1.3. Introduction to Regular Expressions
Section 1.4. grep Basics
Section 1.5. Basic Regular Expressions (grep or grep -G)
Section 1.6. Extended Regular Expressions (egrep or grep -E)
Section 1.7. Fixed Strings (fgrep or grep -F)
Section 1.8. Perl-Style Regular Expressions (grep -P)
Section 1.9. Introduction to grep-Relevant Environment Variables
Section 1.10. Choosing Between grep Types and Performance Considerations
Section 1.11. Advanced Tips and Tricks with grep
Section 1.12. References
6 von 7 Kunden fanden die folgende Rezension hilfreich
Not what I hoped for 3. Juli 2012
Von joepd - Veröffentlicht auf Amazon.com
Format: Taschenbuch
grep is such a tool that one uses continually every unix console session. Great to spend an evening reading up about that tool, just to get introduced to the more advanced uses. 75 pages would be plenty to tell something nice, not deal extensively with regular expressions. So quite some space to tell something new, right?

Wrong. Regular expressions keep on being the central focus of this book, despite being uncapable of telling how they really work. The examples of Advanced Use are how to match lines with IP-addresses and ISBN-numbers, AKA regular expressions. No word on how to make the use of grep itself nicer.

* On page 9., option -e is used without explaining what it does.
* Page 25. It seems like they want to show how to avoid a pipe from one grep to another, but they just show got rid of the cat statement. The text does not make sense, and there is no pointer to where to look in the book to get performance increase.
* p.60: '/' really should have been a '\'.
* In the discussion of command line options, nor of the environment variables, an explanation of the practical difference between 'auto' and 'always' has been omitted. I would have hoped for a discussion on how to use pagers like less with color support (No sweat to figure out yourself: exporting GREP_OPTIONS="--color always" and LESS="-R" works for me to retain the color marks).
* As the final words, the authors warn about using grep on a multitude of files, as this could run into the limits of the system. Of course, a combination of find and xargs is a more subtle and correct one, which does not happen to run into this limit. The authors suggest that one should rebuild the kernel to overcome this limitation. I have not tried it, but I havily syspect that this could be remedied with changing the allowed number of open files imposed by ulimit.

Except for these factual errors, the authors have mainly reiterated what is written in the man and info pages. I was hoping for some interesting tips on how to integrate the usage of grep in daily tasks. The book spends a 30 % of its space to explaining the special characters. This information can be found in a split second with 'man grep | grep -C2 "\^"'. The context options -A, -B, and -C dwell somewhere in obscurity, as they could have been used to show how they make sense while parsing logs, or text written by humans.

I imagine that this book does provide a nice introduction to the command. But if you find yourself navigating man pages regularly, and have encountered a regular expression before, there is not much to gain from this book.
4 von 4 Kunden fanden die folgende Rezension hilfreich
Command man grep and beyond... 24. November 2010
Von DEEPU - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
It has beyond what you will learn from Man pages of grep. Few examples will surely make you understand the power of grep command.
1 von 1 Kunden fanden die folgende Rezension hilfreich
Crash course and beyond 30. Oktober 2013
Von Ekrem Islekcerci - Veröffentlicht auf Amazon.com
Format: Taschenbuch Verifizierter Kauf
Be warned this book is not for those that are on something something for dummiies series. Neither is it for advanced users. It's more for us whose day job entitles going throough thousands of rows of string looking for that one line or two. Data like logs but not restricted too. It is also good as a lookup as it comes in a handy portable wallet size. I liked it and learned alot.
1 von 1 Kunden fanden die folgende Rezension hilfreich
Good Book on the Basics of REGEX & GREP 16. November 2011
Von Roger - Veröffentlicht auf Amazon.com
Format: Taschenbuch
I needed a book that would teach me REGEX and how better to use grep/fgrep, but without having to learn PERL and JAVA. (ie. Master Regular Expressions contains over half the data relevant to other languages.)

This "grep Pocket Reference" did a good job of explaining the grep options in tandem with the it's Manual Page. Although few, I thought the examples near the end were great. However, the examples seemed to be themed on personal private data searching rather then something more relevant to a computer users -- but they could easily be converted.

This EBook needs some corrections (a reprint including errata?) as it contains some grammar or run-on sentences which conflict and provide incorrect data. Also, there's a sentence in the book stating, in effect, it's OK or legal to use fgrep to search other peoples EMail. I'm no lawyer, but this doesn't sound correct. Again, those few sentences probably need a little rewording.

All in all, besides the fact it needed a good proof reading -- the book taught me what I needed to learn about grep as it's manual page lacks examples and a certain amount of clarity. (Currently, grep's manual page is written like a specification rather then something focused towards a user, omitting example usage.)

(There is a small chapter on Perl REGEX. ie. --perl-regexp)

If you need a book to learn REGEX and have a little trouble with the GREP Manual Page, or don't want to read a huge book like Mastering REGEX, get this book for learning REGEX (aka BRE/ERE).

Also noteworthy, the MOBI formated EBook version of this "grep Pocket Reference" is the first readable MOBI EBook I've been able to read so far on my Kindle DXG. This book had few TABLE TAGS (or computer technical drawings/coding). And of the presented console/terminal text presented, it was readable unlike many other MOBI technical books I've tried to read.

Edited 2011.11.19: Also, GREP originates from the line editor called 'ed' (ie. command syntax: g/re/p) according to the author Robbins of the book sed & awk (2nd Edition). The third chapter of the sed & awk (2nd Edition) is devoted to regular expressions (grep), as sed & awk depend on this feature for searching.
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