gdb - customize it the way <b>you</b> want

in the shell, 'gdb <executable> runs gdb on the desired program.
... 'gdb <executable> <PID>' attaches gdb to the already-running process with the given process id (PID).
Use the 'run' command to run the program. use 'run <parameters>' to give it parameters.
when the program runs, you can suspend it with ctrl-C, and get a gdb prompt.

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