quit
quit command (abbreviated q), or
type an end-of-file character (usually C-d). If you do not supply
expression, GDB will terminate normally; otherwise it will
terminate using the result of expression as the error code.
An interrupt (often C-c) does not exit from GDB, but rather terminates the action of any GDB command that is in progress and returns to GDB command level. It is safe to type the interrupt character at any time because GDB does not allow it to take effect until a time when it is safe.
If you have been using GDB to control an attached process or
device, you can release it with the detach command
(see section Debugging an already-running process).
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