gawk-3.1.2: description + notes

gawk is the GNU version of the standard Unix awk. A general purpose text processing language.

The first paragraph of the man page says:

  Gawk is the GNU Project's implementation of the AWK
  programming language.  It conforms to the definition of the
  language in the POSIX 1003.2 Command Language And Utilities
  Standard.  This version in turn is based on the description
  in The AWK Programming Language, by Aho, Kernighan, and
  Weinberger, with the additional features found in the System
  V Release 4 version of UNIX awk.  Gawk also provides more
  recent Bell Labs awk extensions, and some GNU-specific

For more details, see man gawk or the included GNU texinfo (*) in this distribution. The GAWK home page has more information.

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