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gawk: Compatibility Mode

 C.1 Downward Compatibility and Debugging
 ⇒POSIX/GNU, 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'
    If 'gawk' is compiled for debugging with '-DDEBUG', then there is one
 more option available on the command line:
      Print out the parse stack information as the program is being
    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.
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