Get rid of "quit anyway" prompt using GDB: Just kill the process and quit

Turning confirmation prompts off globally disabled many other useful checks, such as the one to ask you if you really want to delete all breakpoints when you type "delete".

It would be better to disable the prompt only for the quit command. You can do that by adding this hook to your ~/.gdbinit (for current user) or /etc/gdb/gdbinit (for all users):

define hook-quit
    set confirm off
end

set confirm off

See gdb doc for details