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The Evolution of the `awk' Language
***********************************

   This manual describes the GNU implementation of `awk', which is
patterned after the POSIX specification.  Many `awk' users are only
familiar with the original `awk' implementation in Version 7 Unix,
which is also the basis for the version in Berkeley Unix (through
4.3-Reno).  This chapter briefly describes the evolution of the `awk'
language.

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V7/S5R3.1
The major changes between V7 and System V Release 3.1.
S5R4
Minor changes between System V Releases 3.1 and 4.
POSIX
New features from the POSIX standard.
POSIX/GNU
The extensions in `gawk' not in POSIX `awk'.