sed & awk

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"O'Reilly Media, Inc.", Mar 1, 1997 - Computers - 434 pages
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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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Contents

Chapter 1 Power Tools for Editing
1
Chapter 2 Understanding Basic Operations
8
Chapter 3 Understanding Regular Expression Syntax
26
Chapter 4 Writing sed Scripts
55
Chapter 5 Basic sed Commands
78
Chapter 6 Advanced sed Commands
106
Chapter 7 Writing Scripts for awk
137
Chapter 8 Conditionals Loops and Arrays
172
Chapter 11 A Flock of awks
255
Chapter 12 FullFeatured Applications
278
Chapter 13 A Miscellany of Scripts
324
A Quick Reference for sed
359
B Quick Reference for awk
365
C Supplement for Chapter 12
382
Index
397
About the Authors
409

Chapter 9 Functions
203
Chapter 10 The Bottom Drawer
227

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About the author (1997)

Dale Dougherty is the publisher of the O'Reilly Network and Director of O'Reilly Research. Dale has been instrumental in many of O'Reilly's most important efforts, including founding O'Reilly & Associates with Tim O'Reilly. He was the developer and publisher of Global Network Navigator (GNN), the first commercial Web site. Dale was developer and publisher of Web Review, the online magazine for Web designers, and he was O'Reilly & Associates' first editor. Dale has written and edited numerous books at O'Reilly & Associates. Dougherty is a Lecturer in the School of Information Management and Systems (SIMS) at the University of California at Berkeley.

Arnold Robbins is a professional programmer and technical author who has worked with Unix systems since 1980 and has been using AWK since 1987. As a member of the POSIX 1003.2 balloting group, he helped shape the POSIX standard for AWK. Arnold is currently the maintainer of gawk and its documentation. He is coauthor of the sixth edition of O'Reilly's Learning the vi Editor.

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