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sed & awk by Dale Dougherty

sed & awk by Dale Dougherty

sed & awk by Dale Dougherty

Product Details:



sed & awk, 2nd Edition


Dale Dougherty



ISBN 10:



O'Reilly Media


Shell text manipulation programs

Place of publication:


Year Published:







2,5 x 22,5 x 17,5 cm

Shipping Weight:

500 gr


100 SEK


sed & awk describes two text manipulation programs that are mainstays of the UNIX programmer's toolbox. This edition covers the sed and awk programs as they are mandated by the POSIX standard and includes discussion of the GNU versions of these programs.

Full Description:

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).

Table of Contents

Chapter 1 Power Tools for Editing

May You Solve Interesting Problems

A Stream Editor

A Pattern-Matching Programming Language

Four Hurdles to Mastering sed and awk

Chapter 2 Understanding Basic Operations

Awk, by Sed and Grep, out of Ed

Command-Line Syntax

Using sed

Using awk

Using sed and awk Together

Chapter 3 Understanding Regular Expression Syntax

That's an Expression

A Line-Up of Characters

I Never Metacharacter I Didn't Like

Chapter 4 Writing sed Scripts

Applying Commands in a Script

A Global Perspective on Addressing

Testing and Saving Output

Four Types of sed Scripts

Getting to the PromiSed Land

Chapter 5 Basic sed Commands

About the Syntax of sed Commands




Append, Insert, and Change




Print Line Number


Readingand Writing Files


Chapter 6 Advanced sed Commands

Multiline Pattern Space

A Case for Study

Hold That Line

Advanced Flow Control Commands

To Join a Phrase

Chapter 7 Writing Scripts for awk

Playing the Game

Hello, World

Awk's Programming Model

Pattern Matching

Records and Fields


System Variables

Relational and Boolean Operators

Formatted Printing

Passing Parameters Into a Script

Chapter 8 Conditionals, Loops, and Arrays

Conditional Statements


Other Statements That Affect Flow Control


An Acronym Processor

System Variables That Are Arrays

Chapter 9 Functions

Arithmetic Functions

String Functions

Writing Your Own Functions

Chapter 10 The Bottom Drawer

The getline Function

The close( ) Function

The system( ) Function

A Menu-Based Command Generator

Directing Output to Files and Pipes

Generating Columnar Reports



Invoking awk Using the #! Syntax

Chapter 11 Full-Featured Applications

An Interactive Spelling Checker

Generating a Formatted Index

Spare Details of the masterindex Program

Chapter 12 A Miscellany of Scripts

uutot.awk—Report UUCP Statistics

phonebill—Track Phone Usage

combine—Extract Multipart uuencoded Binaries

mailavg—Check Size of Mailboxes

adj—Adjust Lines for Text Files

readsource—Format Program Source Files for troff

gent—Get a termcap Entry

plpr—lpr Preprocessor

transpose—Perform a Matrix Transposition

m1—Simple Macro Processor

Appendix A Quick Reference for sed

Command-Line Syntax

Syntax of sed Commands

Command Summary for sed

Appendix B Quick Reference for awk

Command-Line Syntax

Language Summary for awk

Command Summary for awk


About the Author(s):

Dale Dougherty

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 theSchoolofInformation Managementand Systems (SIMS) at theUniversityofCaliforniaatBerkeley.


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