Shell Tools
awk, sed, and egrep are a related set of Unix shell tools for text processing. awk and egrep use a DFA match engine, and sed uses an NFA engine. For an explanation of the rules behind these engines, see Section 1.2.
This reference covers GNU egrep 2.4.2, a program for searching lines of text; GNU sed 3.02, a tool for scripting editing commands; and GNU awk 3.1, a programming language for text processing.
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