How do I debug the child process after fork() in gdb?

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Look at this. Use: 

set follow-fork-mode <mode>

Set the debugger response to a program call of fork or vfork. A call to fork or vfork creates a new process. The <mode> argument can be:

parent: The original process is debugged after a fork. The child process runs unimpeded. This is the default.

child: The new process is debugged after a fork. The parent process runs unimpeded.

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