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sed & awk (Nutshell Handbooks)
 
 

sed & awk (Nutshell Handbooks) [Kindle Edition]

Arnold Robbins , Dale Dougherty
4.5 von 5 Sternen  Alle Rezensionen anzeigen (20 Kundenrezensionen)

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Produktbeschreibungen

Kurzbeschreibung

sed & awk describes two text processing programs that are mainstays of the UNIX programmer's toolbox.sed is a "stream editor" for editing streams of text that might be too large to edit as a single file, or that might be generated on the fly as part of a larger data processing step. The most common operation done with sed is substitution, replacing one block of text with another.awk is a complete programming language. Unlike many conventional languages, awk is "data driven" -- you specify what kind of data you are interested in and the operations to be performed when that data is found. awk does many things for you, including automatically opening and closing data files, reading records, breaking the records up into fields, and counting the records. While awk provides the features of most conventional programming languages, it also includes some unconventional features, such as extended regular expression matching and associative arrays. sed & awk describes both programs in detail and includes a chapter of example sed and awk scripts.This edition covers features of sed and awk that are mandated by the POSIX standard. This most notably affects awk, where POSIX standardized a new variable, CONVFMT, and new functions, toupper() and tolower(). The CONVFMT variable specifies the conversion format to use when converting numbers to strings (awk used to use OFMT for this purpose). The toupper() and tolower() functions each take a (presumably mixed case) string argument and return a new version of the string with all letters translated to the corresponding case.In addition, this edition covers GNU sed, newly available since the first edition. It also updates the first edition coverage of Bell Labs nawk and GNU awk (gawk), covers mawk, an additional freely available implementation of awk, and briefly discusses three commercial versions of awk, MKS awk, Thompson Automation awk (tawk), and Videosoft (VSAwk).

Synopsis

This is a reference guide to the information presented in the larger volumes. It presents a concise summary of regular expressions and pattern matching, and summaries of Sed and Awk. This edition has expanded coverage of Gawk (GNU Awk), and includes sections on: an overview of Sed and Awk's command line syntax; alphabetical summaries of commands, including Nawk and Gawk; profiling with PGawk; coprocesses and sockets with Gawk; internationalization with Gawk; and a listing of resources for Sed and Awk users.

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Kundenrezensionen

4.5 von 5 Sternen
4.5 von 5 Sternen
Die hilfreichsten Kundenrezensionen
3 von 3 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Powerful tools for text manipulation 15. April 2000
Format:Taschenbuch
Unix has earned itself quite a reputation for its potent tools, used for batch editing of text files (like program output). Sed and Awk are two of these tools. Sed is a direct descendent of Ed, the original Unix line editor, which employs regular expressions, a powerful method for description of patterns in text, for operations like substitute, append or delete. Awk is a complete scripting language with programming structures like conditionals, loops, functions etc., developed in 1970's by Alfred Aho, Brian Kernighan and Peter Weinberger (hence A-W-K). The trio has also written a book on Awk.

Dale Dougherty (in the 2nd edition with Arnold Robbins, maintainer of GNU Awk and author of several more books on Awk programming language) have made a good job in making a thoroughly readable tutorial on Sed and Awk. However, it remains a mystery to me how they succeeded to fill no less than 407 pages with it. Mind you, Sed and Awk are not really some big monsters. There exist something like two dozens of operators in Sed (most of them you will probably never use), and the syntax of Awk mimics those of C programming language, so it is likely that you know it already. Once you grok the idea of regular expressions, you should become a proficient user of Awk in about 30 minutes.

In conclusion, go buy the book if your need to manipulate text files on Unix and you think you need a lengthy tutorial with a gentle learning curve. Otherwise, short references on Awk and Sed, like the ones in "Unix Power Tools" and a bunch of examples showing some tricks you might not think of, will probably be more useful. In addition, it is good to know that during the nineties, much of the focus has drifted from Awk to Perl, so you might consider a book on Perl as well.
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2 von 2 Kunden fanden die folgende Rezension hilfreich
4.0 von 5 Sternen Great introduction, mediocre reference 12. Mai 2000
Format:Taschenbuch
I was very interested in learning sed and awk, and so picked up this book. Like most O'Reilly titles, it is an excellent piece of work. I learned a great deal and was able to get started and pump out some useful code after spending some time with this book. However, I soon found that when it came to tackling some very difficult tasks with sed and awk, this book didn't seem to serve me very well as a reference. I have a feeling that sed and awk are not the sort of thing that one could learn with just one book; there are so many applications for these tools that one must choose what one wishes to do, and find the right books to supplement this excellent text.
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1 von 1 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen This book has saved my bacon 30. Mai 2000
Von bernie
Format:Taschenbuch
Say what you will about the depth of this book. I am here to tell you that on more than one occasion this book has saved my bacon. Several times in different environments I needed to use sed to correct data in flat files. Once I used sed to change the format and numbers when we wanted to match accounting numbers to a different system. I haven't used that much awk. However there has been occasion to transfer awk programs from one Unix to a different Unix flavor. I found that the regular awk in this book was newer than the newawk in the other system. I Still keep the book handy incase I get squeezed for time and have to manipulate files. However I am learning more and more to appreciate PERL on those occasions.
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1 von 1 Kunden fanden die folgende Rezension hilfreich
5.0 von 5 Sternen UNIX wirkungsvoll mit AWK und SED im Einsatz 12. Januar 2011
Format:Taschenbuch
Dieses Buch ist unentbehrlich für den UNIX Entwickler und Administrator. Viele Anregungen mit AWK und SED vereinfachen die tägliche Arbeit mit UNIX und schaffen Freiraum für Automatisierungskonzepte.
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5.0 von 5 Sternen New perspectives 1. Februar 2000
Von Ein Kunde
Format:Taschenbuch
Even if you've done a lot of Unix scripting (mostly in Perl as I did), this book will change the way you get your work done. Not only does it show you what can be done with awk, far easier than in Perl. It also is a great intro to regular expressions. This one gave me the basics I would have needed years before. ;-)

Plain, understandable language, very good tutorial. Keep "Unix in a nutshell" close, if you ned sed and awk references, because that's not what this book is good for.

Someone here said that this book saved him from carpal tunnel, and believe him, it will also save YOU. ;-)
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4.0 von 5 Sternen Great book for beginners. 17. September 1998
Von Ein Kunde
Format:Taschenbuch
Just finished it. Great book for beginners, tends to focus a bit on the non-programmer. However, it is revealing, showing you how to automatically edit things you usually do manually. Could have used some exercises, and some special problems at the end of each chapter, so you could practice what you learned in that chapter. Great book otherwise.
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Von Vamp898
Format:Kindle Edition|Verifizierter Kauf
Wer darüber nachdenkt sich dieses Buch zu kaufen sollte eventuell vorher "Classic Shell Scripting" des selben Verlags lesen.

Dieses Buch beschreibt hervorragend sed & awk, aber eben nicht mehr. Viele Dinge in dem Buch machen natürlich nur Sinn oder ergeben einen Nutzen wenn man fundierte Shell-Scripting Fähigkeiten vorweisen kann.
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Von Me MJT
Format:Taschenbuch|Verifizierter Kauf
Eigentlich hatte ich mir "sed & awk" gekauft weil ich meine Kenntnisse mit sed vertiefen wollte. Dafür ist es auch sehr gut geeignet. Allerdings erklärt der Arnold Robbins sed von den Grundlagen an bis hin zu aufwändigen sed-Skripten. Damit ist es auch für Anfänger geeignet.

Mit awk verhält es sich im Buch genauso. Alles wird erklärt, von den Anfängen bis zu den komplexen Skripten.

Für jemanden, der nicht nur online lernt ein sehr gutes Buch. Natürlich gibt es zu diesen beiden betagten Unix-Werkzeugen eine Menge an Tutorials und Beispielen im Internet, aber das schmälert nicht den Wert dieses Buches.
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Die neuesten Kundenrezensionen
4.0 von 5 Sternen great for learning sed and awk, but an updated third edition would be...
All of sed and awk that most unix users know, including many professional administrators, is 's/this/that/' and '{ print $1 }'

But there is so much more these two tools... Lesen Sie weiter...
Veröffentlicht am 26. August 2011 von Kurt Keller
5.0 von 5 Sternen A Must !
This book from the GREAT O'reilly Collection is a must for anyone who wants to master 'sed' and 'awk', a POWERFUL set of Unix tools, which are too often ignored or under-utilized. Lesen Sie weiter...
Veröffentlicht am 13. Januar 2000 von Philippe Bourdon
4.0 von 5 Sternen Very straigtforward instructions with good examples
I found this book useful and entertaining
Am 15. Juni 1999 veröffentlicht
3.0 von 5 Sternen Good tutorial, problematic reference
I suppose if the proof of the teaching is in the learning, the authors' idea (in this edition) of interlacing their discussions of Sed and Awk throughout the volume is vindicated,... Lesen Sie weiter...
Veröffentlicht am 25. Mai 1999 von Paul Emmons (pemmons@voicenet.com)
4.0 von 5 Sternen A must have for the wannabe UNIX wizard
This is a good book. Although I find some of the information that I need. There seems to be a fair amount that's concealed by the books approach to each topic.
Am 24. April 1999 veröffentlicht
5.0 von 5 Sternen Amaze & Astound your work mates :)
simple yet powerful commands, you'll wonder how you ever did without it
Am 25. Februar 1999 veröffentlicht
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Beliebte Markierungen

 (Was ist das?)
&quote;
The -n option suppresses the automatic output. &quote;
Markiert von 12 Kindle-Nutzern
&quote;
Awk, in the usual case, interprets each input line as a record and each word on that line, delimited by spaces or tabs, as a field. &quote;
Markiert von 9 Kindle-Nutzern
&quote;
There are three ways to specify multiple instructions on the command line: &quote;
Markiert von 7 Kindle-Nutzern

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