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UNIX® Shells by Example, Third Edition
book

UNIX® Shells by Example, Third Edition

by Ellie Quigley
October 2001
Intermediate to advanced content levelIntermediate to advanced
1040 pages
22h 50m
English
Pearson
Content preview from UNIX® Shells by Example, Third Edition

7.10. awk Built-In Functions

7.10.1. String Functions

The sub and gsub Functions. The sub function matches the regular expression for the largest and leftmost substring in the record, and then replaces that substring with the substitution string. If a target string is specified, the regular expression is matched for the largest and leftmost substring in the target string, and the substring is replaced with the substitution string. If a target string is not specified, the entire record is used.

FORMAT

sub (regular expression, substitution string);
sub (regular expression, substitution string, target string)
Example 7.61.
1  % nawk '{sub(/Mac/, "MacIntosh"); print}' filename
2  % nawk '{sub(/Mac/, "MacIntosh", $1); print}' filename
					

EXPLANATION ...

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Publisher Resources

ISBN: 013066538XPurchase book