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sed & awk (Nutshell Handbooks) (Englisch) Taschenbuch – 1. März 1997


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Produktinformation

  • Taschenbuch: 432 Seiten
  • Verlag: O'Reilly & Associates; Auflage: 2 (1. März 1997)
  • Sprache: Englisch
  • ISBN-10: 1565922255
  • ISBN-13: 978-1565922259
  • Größe und/oder Gewicht: 17,8 x 2,5 x 23,3 cm
  • Durchschnittliche Kundenbewertung: 4.5 von 5 Sternen  Alle Rezensionen anzeigen (20 Kundenrezensionen)
  • Amazon Bestseller-Rang: Nr. 60.113 in Fremdsprachige Bücher (Siehe Top 100 in Fremdsprachige Bücher)
  • Komplettes Inhaltsverzeichnis ansehen

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Produktbeschreibungen

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 und weitere Mitwirkende

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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3 von 3 Kunden fanden die folgende Rezension hilfreich Von Primoz Peterlin am 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 Von Erik L. Arneson am 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 Von bernie am 30. Mai 2000
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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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 can do. And this book shows you how. In each of the two major parts things are laid out in a logical manner building up knowledge thoroughly from the ground up, all supported by lots of well explained examples.

Both, sed and awk, rely heavily on regular expressions and the authors don't let you down in this area either. Chapter 3 is dedicated to equip you with a well enough working knowledge of regular expressions. It surely is not as thorough as Jeffry Friedl's "Mastering Regular Expressions", but the chapter packs a lot of information into the 29 pages. Especially with awk, there are quite a number of different versions out there and they are not quite identical in feature scope. Differences among some major implementations are discussed as well. Finally, in the appendices, you can find a quick reference for both sed and awk.

As thorough (and even beginner friendly) as the book is, it does have one drawback: it is old. Much of the sample code deals with manipulating troff files or uucp logs. Both things many unix/linux users of today have no idea about. The reliance on such old samples is not a problem per se, they still do the job of demonstrating concepts and usage of sed and awk quite nicely. But these samples are much less applicable to sed/awk users today than they were twenty years ago when the first edition of this book was published. What I also think would be badly needed in an updated third revision is a discussion of how to use these tools with non-English charactersets and Unicode.
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1 von 1 Kunden fanden die folgende Rezension hilfreich Von Klaus Loewenhagen am 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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