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sed and awk (Nutshell Handbooks) (Taschenbuch)

von Dale Dougherty (Autor), Arnold Robbins (Autor)
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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

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).

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sed and awk (Nutshell Handbooks)
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Kundenrezensionen

16 Rezensionen
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4.4 von 5 Sternen (16 Kundenrezensionen)
 
 
 
 
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3 von 3 Kunden fanden die folgende Rezension hilfreich:
4.0 von 5 Sternen Powerful tools for text manipulation, 16. April 2000
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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1 von 1 Kunden fanden die folgende Rezension hilfreich:
5.0 von 5 Sternen This book has saved my bacon, 31. Mai 2000
Von bernie "xyzzy" (Arlington, Texas) - Alle meine Rezensionen ansehen
(TOP 500 REVIEWER)   
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:
4.0 von 5 Sternen Great introduction, mediocre reference, 13. Mai 2000
Von Erik L. Arneson (Medford, OR USA) - Alle meine Rezensionen ansehen
(REAL NAME)   
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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Die neuesten Kundenrezensionen

5.0 von 5 Sternen New perspectives
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. Lesen Sie weiter...
Am 1. Februar 2000 veröffentlicht

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 14. Januar 2000 von Philippe Bourdon

4.0 von 5 Sternen Very straigtforward instructions with good examples
I found this book useful and entertaining
Am 16. 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 26. Februar 1999 veröffentlicht

5.0 von 5 Sternen A necessity for every Unix System Administrator
This is a well written technical book. It will lead you from the very basic to the most advance concept of sed & awk. Lesen Sie weiter...
Am 10. November 1998 veröffentlicht

4.0 von 5 Sternen Great book for beginners.
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... Lesen Sie weiter...
Am 18. September 1998 veröffentlicht

4.0 von 5 Sternen Amazing..
This book took me from a state of loathing and ignorance of awk, to a complete awk fanatic, nowadays most of my scripts have some awk in them somewhere. Lesen Sie weiter...
Veröffentlicht am 3. Juli 1998 von vincent@synchromatic.com

5.0 von 5 Sternen It is a greta book for sripts
It is just too good. Orielly has one of the best books for Unix programming and other related tools
Am 16. Juni 1998 veröffentlicht

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