awk
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The AWK utility is a data extraction and reporting tool that uses a data-driven scripting language consisting of a set of actions to be taken against textual data (either in files or data streams) for the purpose of producing formatted reports. The language used by awk extensively uses the string datatype , associative arrays (that is, arrays indexed by key strings), and regular expressions . AWK is one of the early tools to appear in Version 7 Unix and gained popularity as a way to add computational features to a Unix pipeline . A version of the AWK language is a standard feature of nearly every modern Unix-like operating system available today. AWK is mentioned in the Single UNIX Specification as one of the mandatory utilities of a Unix operating system .
AWK - Wikipedia, the free encyclopedia
The AWK Programming Language
The AWK book has been translated: Alternative books that contain significant amounts of AWK include Effective AWK Programming, 3rd edition by Arnold Robbins (O'Reilly, 2001, ISBN 0-596-00070-7), and Sed & Awk, 2nd edition by Dale Dougherty and Arnold Robbins (O'Reilly, 1997, ISBN 1-56592-225-5).