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The first place to look for detailed information about the awk programming language is The AWK Programming Language (Alfred V. Aho, Brian W. Kernighan and Peter J. Weinberger; Addison-Wesley, 1988). This is the ``canonical'' (definitive) book on awk; the authors are the original developers of the language. It contains a tutorial, a detailed definition of the language, and a series of applications ranging from the simple to the highly technical.
A second book on awk is sed & awk (Dale Dougherty; O'Reilly & Associates, Inc., 1991). This book contains an overview and tutorial in the use of each of these programs.