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grep Pocket Reference (Anglais) Broché – 6 février 2009


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grep Pocket Reference Presents grep, a utility program that helps you locate content in any file on a Unix or Linux system. This book lets you learn methods for filtering large files for specific content. It is suitable for system administrators, security professionals, and developers. Full description


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Couverture | Copyright | Table des matières | Extrait | Index | Quatrième de couverture
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20 internautes sur 20 ont trouvé ce commentaire utile 
A very handy reference 8 février 2009
Par calvinnme - Publié sur Amazon.com
Format: Broché Achat vérifié
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 internautes sur 7 ont trouvé ce commentaire utile 
Not what I hoped for 3 juillet 2012
Par joepd - Publié sur Amazon.com
Format: Broché
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 internautes sur 4 ont trouvé ce commentaire utile 
Command man grep and beyond... 24 novembre 2010
Par DEEPU - Publié sur Amazon.com
Format: Broché Achat vérifié
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 internautes sur 1 ont trouvé ce commentaire utile 
Crash course and beyond 30 octobre 2013
Par Ekrem Islekcerci - Publié sur Amazon.com
Format: Broché Achat vérifié
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 internautes sur 1 ont trouvé ce commentaire utile 
Good Book on the Basics of REGEX & GREP 16 novembre 2011
Par Roger - Publié sur Amazon.com
Format: Broché
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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