sed & awk (Google eBook)
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).
What people are saying - Write a review
Review: sed & awkUser Review - Goodreads
Excellent reference on sed&awk, provides clear examples. I found the book easy to follow and to understand. It will serve as a reference for me in future.
Review: sed & awkUser Review - Darin Brezeale - Goodreads
I really don't care for this book. It's probably OK if I wanted to read the entire thing to learn to use sed and awk, but it makes a poor reference. Virtually every time I have turned to this book to ... Read full review
Chapter 3 Understanding Regular Expression Syntax
Chapter 4 Writing sed Scripts
Chapter 5 Basic sed Commands
Chapter 6 Advanced sed Commands
Chapter 7 Writing Scripts for awk
Chapter 8 Conditionals Loops and Arrays
Chapter 11 A Flock of awks
Chapter 12 FullFeatured Applications
Chapter 13 A Miscellany of Scripts
A Quick Reference for sed
B Quick Reference for awk
C Supplement for Chapter 12
About the Authors
Chapter 9 Functions
Chapter 10 The Bottom Drawer