You're reading from Linux Command Line and Shell Scripting Bible - Third Edition

Product typeBook

Published inJan 2015

PublisherWiley

ISBN-139781118983843

Edition3rd Edition

Tools

Linux

Concepts

Shell Scripting

Authors (2):

Richard Blum

Christine Bresnahan

View More author details

Summary

If you manipulate data files in shell scripts, you need to become familiar with regular expressions. Regular expressions are implemented in Linux utilities, programming languages, and applications using regular expression engines. A host of different regular expression engines is available in the Linux world. The two most popular are the POSIX Basic Regular Expression (BRE) engine and the POSIX Extended Regular Expression (ERE) engine. The sed editor conforms mainly to the BRE engine, while the gawk program utilizes most features found in the ERE engine.

A regular expression defines a pattern template that's used to filter text in a data stream. The pattern consists of a combination of standard text characters and special characters. The special characters are used by the regular expression engine to match a series of one or more characters, similarly to how wildcard characters work in other applications.

By combining characters and special characters, you can define a pattern...

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Linux Command Line and Shell Scripting Bible - Third Edition

Published in: Jan 2015Publisher: WileyISBN-13: 9781118983843

Authors (2)

Richard Blum

Richard Blum has more than 25 years as a network and systems administrator, currently managing Microsoft, Unix, Linux, and Novell servers for a network with more than 3,500 users. He has developed online programming and Linux courses that he teaches to students worldwide.
Read more about Richard Blum

Christine Bresnahan

Christine Bresnahan has worked in the IT industry for more than 30 years and is currently an adjunct professor of Python programming and Linux system administration classes at Ivy Tech Community College in Indianapolis. She is the co-author of Linux Bible, Eighth Edition, and Linux Command Line and Shell Scripting Bible.
Read more about Christine Bresnahan

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