File: gawk.info,  Node: Common Extensions,  Next: Ranges and Locales,  Prev: Feature History,  Up: Language History

A.7 Common Extensions Summary
=============================

The following table summarizes the common extensions supported by
'gawk', Brian Kernighan's 'awk', and 'mawk', the three most widely used
freely available versions of 'awk' (*note Other Versions::).

Feature                      BWK 'awk'   'mawk'   'gawk'   Now standard
--------------------------------------------------------------------------
'\x' escape sequence         X           X        X
'FS' as null string          X           X        X
'/dev/stdin' special file    X           X        X
'/dev/stdout' special file   X           X        X
'/dev/stderr' special file   X           X        X
'delete' without subscript   X           X        X        X
'fflush()' function          X           X        X        X
'length()' of an array       X           X        X
'nextfile' statement         X           X        X        X
'**' and '**=' operators     X                    X
'func' keyword               X                    X
'BINMODE' variable                       X        X
'RS' as regexp               X           X        X
Time-related functions                   X        X