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http://pubs.opengroup.org/onlinepubs/7908799/xcu/awk.html#tag_000_000_108_016
The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group
Grammar
The grammar in this section and the lexical conventions in the following section will together describe the syntax for awk programs. The general conventions for this style of grammar are described in . A valid program can be represented as the non-terminal symbol program in the grammar. This formal syntax takes precedence over the preceding text syntax description.
Grammar in a broad sense fetched on 26 July 2013 by Vadim Zaytsev, http://grammarware.net