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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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).
Über den Autor
Dale Dougherty is president and CEO of Songline Studios, a leading web publishing company. He is editor and publisher of Web Review (webreview.com), an innovative online magazine for web site developers. Prior to Songline, Dougherty developed the Global Network Navigator (GNN) and was the founding editor for O'Reilly's Nutshell Handbooks (R). Arnold Robbins, an Atlanta native, is a professional programmer and technical author. He has been working with UNIX systems since 1980, when he was intoduced to a PDP-11 running a version of Sixth Edition UNIX. He has been a heavy awk user since 1987, when he became involved with gawk, the GNU project's version of awk. As a member of the POSIX 1003.2 balloting group, he helped shape the POSIX standard for awk. He is currently the maintainer of gawk and its documentation. The documentation is available from the Free Software Foundation (http://www.gnu.org) and has also been published by SSC (http://www.ssc.com) as "Effective AWK Programming." He is also co-author of the sixth edition of O'Reilly's Learning the vi Editor. Since late 1997, he and his family have been living happily in Israel.
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In diesem Buch
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Ausgewählte Seiten ansehen
Buchdeckel | Copyright | Inhaltsverzeichnis | Auszug | Stichwortverzeichnis | Rückseite
Buchdeckel | Copyright | Inhaltsverzeichnis | Auszug | Stichwortverzeichnis | Rückseite
Kundenrezensionen
Die hilfreichsten Kundenrezensionen
3 von 3 Kunden fanden die folgende Rezension hilfreich
Von Primoz Peterlin
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.
1 von 1 Kunden fanden die folgende Rezension hilfreich
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.
1 von 1 Kunden fanden die folgende Rezension hilfreich
Von M. Baedke
Format:Taschenbuch
sondern auch als regexp/sed/awk Schnelleinstieg geeignet: es enthält zwar kurze, aber sehr gut verständliche Beschreibungen der Arbeitsweise der einzelnen Werkzeuge. Zwar fehlt ein alphabetischer Index, aber es gibt alphabetische Listen der sed und awk Kommandos. Sehr praktisch ist der Abschnitt über reguläre Ausdrücke.
Fazit: äußerst nützlich.
Fazit: äußerst nützlich.
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4.3 von 5 Sternen
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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...
But there is so much more these two tools... Lesen Sie weiter...
Vor 21 Monaten von Kurt Keller veröffentlicht
5.0 von 5 Sternen
This book has saved my bacon
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. Lesen Sie weiter...
Veröffentlicht am 30. Mai 2000 von bernie
4.0 von 5 Sternen
Great introduction, mediocre reference
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. Lesen Sie weiter...
Veröffentlicht am 12. Mai 2000 von Erik L. Arneson
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 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
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
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