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(gdb.info)Running

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Running Programs Under GDB
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   When you run a program under GDB, you must first generate debugging
information when you compile it.

   You may start GDB with its arguments, if any, in an environment of
your choice.  If you are doing native debugging, you may redirect your
program's input and output, debug an already running process, or kill a
child process.

Compilation

Compiling for debugging

Starting

Starting your program

Arguments

Your program's arguments

Environment

Your program's environment

Working Directory

Your program's working directory

Input/Output

Your program's input and output

Attach

Debugging an already-running process

Kill Process

Killing the child process

Threads

Debugging programs with multiple threads

Processes

Debugging programs with multiple processes