Rating:
(58 reviews)
Author: Arnold Robbins
ISBN : 0596003528
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From the Publisher
sed & awk, one of the most popular books in O'Reilly & Associates' Nutshell series, 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 new edition covers features of sed and awk that are now 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).
--This text refers to an alternate
Paperback
edition.
From the Back Cover
The book begins with an overview and a tutorial that demonstrate a progression in functionality from grep to sed to awk. sed and awk share a similar command-line syntax, accepting user instructions in the form of a script. Because all three programs use UNIX regular expressions, an entire chapter is devoted to understanding UNIX regular expression syntax. Next, the book describes how to write sed scripts. After getting started by writing a few simple scripts, you'll learn other basic commands that parallel manual editing actions, as well as advanced commands that introduce simple programming constructs. Among the advanced commands are those that manipulate the hold space, a set-aside temporary buffer. The second part of the book has been extensively revised to include POSIX awk as well as coverage of three freely available and three commercial versions of awk. The book introduces the primary features of the awk language and how to write simple scripts. You'll also learn: common programming constructs; how to use awk's built-in functions; how to write user-defined functions; debugging techniques for awk programs; how to develop an application that processes an index, demonstrating much of the power of awk; and FTP and contact information for obtaining various versions of awk. Also included is a miscellany of user-contributed scripts that demonstrate a wide range of sed and awk scripting styles and techniques.
--This text refers to an alternate
Paperback
edition.
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Books with free ebook downloads available Free sed and awk Pocket Reference, 2nd Edition
- Series: Pocket Reference (O'Reilly)
- Paperback: 52 pages
- Publisher: O'Reilly Media; 2nd edition (June 19, 2002)
- Language: English
- ISBN-10: 0596003528
- ISBN-13: 978-0596003524
- Product Dimensions: 0.2 x 4.2 x 6.9 inches
- Shipping Weight: 2.1 ounces (View shipping rates and policies)
Free sed and awk Pocket Reference, 2nd Edition
I've had this book for 3-4 years now and find it to be my handiest reference. I even use ot more than my vi book.
The raw power of sed and awk will humble even the proudest VB programmer and this book will help you get the most out of both the "Aho, Weinberg and Kernigan" and the "stream editor".
The first chapter section is entitled "May You Solve Interesting Problems" a paraphrase of the old Chinese curse, but with sed and awk no problem seems insurmountable and will make all problems appear interesting.
This book is an outstanding reference and will get you up and running with both of these handy little programs in no time.
Just to give you an example - the first time I ever used these programs (sed and awk) I developed a cron script to query a database every day at midnight, sort the results, grabbed lines with tagged values within certain limits, added a few totals, did some averaging, "starred" the lines that departed from certain parameters, then formatted the results into a report with a header showing the dates, times and query results, statistics then packed them into a report file and e-mailed them to a dozen recipients and added a few recipients if the data was outside certain values.
I did this remarkable feat by copying a few examples from the book, changing a thing or two and in the end had a little shell script that was a few K-bytes at the most.
This VB guy from corporate worked on a VB version of the same function and ended up with six revisions, several megs in the executable and never was able to get it formatted right. Not to say that it couldn't be done but..... I wrote mine before lunch one day. He worked on his for weeks and weeks.
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