A.3 Changes Between SVR4 and POSIX awk
The POSIX Command Language and Utilities standard for awk (1992)
introduced the following changes into the language:
- The use of -W for implementation-specific options
(see Options).
- The use of
CONVFMT
for controlling the conversion of numbers
to strings (see Conversion).
- The concept of a numeric string and tighter comparison rules to go
with it (see Typing and Comparison).
- The use of built-in variables as function parameter names is forbidden
(see Definition Syntax.
- More complete documentation of many of the previously undocumented
features of the language.
See Common Extensions, for a list of common extensions
not permitted by the POSIX standard.
The 2008 POSIX standard can be found online at
http://www.opengroup.org/onlinepubs/9699919799/.