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Downward Compatibility and Debugging

@xref{POSIX/GNU, ,Extensions in @command{gawk} Not in POSIX @command{awk}}, for a summary of the GNU extensions to the @command{awk} language and program. All of these features can be turned off by invoking @command{gawk} with the @option{--traditional} option or with the @option{--posix} option.

If @command{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 @command{gawk} developers and not for the casual user. It probably has not even been compiled into your version of @command{gawk}, since it slows down execution.

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