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gawk: Debugger Invocation

 14.2.1 How to Start the Debugger
 Starting the debugger is almost exactly like running 'gawk' normally,
 except you have to pass an additional option, '--debug', or the
 corresponding short option, '-D'.  The file(s) containing the program
 and any supporting code are given on the command line as arguments to
 one or more '-f' options.  ('gawk' is not designed to debug command-line
 programs, only programs contained in files.)  In our case, we invoke the
 debugger like this:
      $ gawk -D -f getopt.awk -f join.awk -f uniq.awk -1 inputfile
 where both 'getopt.awk' and 'uniq.awk' are in '$AWKPATH'.  (Experienced
 users of GDB or similar debuggers should note that this syntax is
 slightly different from what you are used to.  With the 'gawk' debugger,
 you give the arguments for running the program in the command line to
 the debugger rather than as part of the 'run' command at the debugger
 prompt.)  The '-1' is an option to 'uniq.awk'.
    Instead of immediately running the program on 'inputfile', as 'gawk'
 would ordinarily do, the debugger merely loads all the program source
 files, compiles them internally, and then gives us a prompt:
 from which we can issue commands to the debugger.  At this point, no
 code has been executed.
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