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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 (see Other Versions).

FeatureBWK awkmawkgawkNow standard
\x’ escape sequenceXXX
FS as null stringXXX
/dev/stdin special fileXXX
/dev/stdout special fileXXX
/dev/stderr special fileXXX
delete without subscriptXXXX
fflush() functionXXXX
length() of an arrayXXX
nextfile statementXXXX
** and **= operatorsXX
func keywordXX
BINMODE variableXX
RS as regexpXX
Time-related functionsXX