gawk: Compatibility Mode

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1 C.1 Downward Compatibility and Debugging
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1 
1 ⇒POSIX/GNU, for a summary of the GNU extensions to the 'awk'
1 language and program.  All of these features can be turned off by
1 invoking 'gawk' with the '--traditional' option or with the '--posix'
1 option.
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1    If 'gawk' is compiled for debugging with '-DDEBUG', then there is one
1 more option available on the command line:
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1 '-Y'
1 '--parsedebug'
1      Print out the parse stack information as the program is being
1      parsed.
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1    This option is intended only for serious 'gawk' developers and not
1 for the casual user.  It probably has not even been compiled into your
1 version of 'gawk', since it slows down execution.
1