sed & awk

UNIX Power Tools

Dale Dougherty, Arnold Robbins

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English

O'Reilly Media
01 March 1997

Utilities & tools; Operating systems

Series: Nutshell Handbooks

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).

By: Dale Dougherty
Contributions by: Arnold Robbins
Imprint: O'Reilly Media
Country of Publication: United States [Currently unable to ship to USA: see Shipping Info]
Edition: 2nd Revised edition
Dimensions: Height: 240mm, Width: 180mm, Spine: 25mm
Weight: 722g
ISBN: 9781565922259
ISBN 10: 1565922255
Series: Nutshell Handbooks
Pages: 432
Publication Date: 01 March 1997
Recommended Age: 18+
Audience: College/higher education , Professional and scholarly , Professional & Vocational , A / AS level , Further / Higher Education
Format: Paperback
Publisher's Status: Active

"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."

Reviews for sed & awk: UNIX Power Tools

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