A.6 Common Extensions Summary
This section summarizes the common extensions supported
by gawk, Brian Kernighan’s awk, and mawk,
the three most widely-used freely available versions of awk
(see section Other Freely Available awk Implementations).
| Feature | BWK Awk | Mawk | GNU Awk |
|---|
| ‘\x’ Escape sequence | X | X | X |
RS as regexp | | X | X |
FS as null string | X | X | X |
| ‘/dev/stdin’ special file | X | | X |
| ‘/dev/stdout’ special file | X | X | X |
| ‘/dev/stderr’ special file | X | X | X |
** and **= operators | X | | X |
func keyword | X | | X |
nextfile statement | X | X | X |
delete without subscript | X | X | X |
length() of an array | X | | X |
fflush() function | X | X | X |
BINMODE variable | | X | X |
