The "dbx" debugger on the RS/6000's can be used on any program that
will compile. To prepare the executable to be read by dbx, compile
with the -g option:
Fortran: xlf -g prog.f C: xlc -g prog.c
There are several sources of information on line that describe the debugger.
Unix document U-029, "The dbx Debugger on the RS/6000"Type "man dbx" to bring up the Unix manual information .
Additional dbx tutorial links: