# Common Linux Signals • SIGHUP (1): Terminal hangup; reloads configuration. • SIGINT (2): Interrupt from keyboard (Ctrl+C). • SIGQUIT (3): Quit from keyboard, with core dump. • SIGKILL (9): Forcefully kill a process (cannot be caught or ignored). • SIGTERM (15): Termination signal; graceful shutdown. • SIGSTOP (19): Stop a process (cannot be caught). • SIGCONT (18): Continue a stopped process. • SIGUSR1 (10), SIGUSR2 (12): User-defined signals for custom behavior. • SIGCHLD (17): Sent to parent when a child process terminates. Use kill -SIGNAL [PID] to send a signal to a process.