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Downward Compatibility and Debugging
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   Note: Extensions in `gawk' Not in POSIX `awk', for a
summary of the GNU extensions to the `awk' language and program.  All
of these features can be turned off by invoking `gawk' with the
`--traditional' option or with the `--posix' option.

   If `gawk' is compiled for debugging with `-DDEBUG', then there is
one more option available on the command line:

`-W parsedebug'
`--parsedebug'
     Print out the parse stack information as the program is being
     parsed.

   This option is intended only for serious `gawk' developers and not
for the casual user.  It probably has not even been compiled into your
version of `gawk', since it slows down execution.