kill

Sends a signal to a process, usually related to stopping the process. All signals except for SIGKILL and SIGSTOP can be intercepted by the process to perform a clean exit. More information: https://manned.org/kill.1posix.

  • Terminate a program using the default SIGTERM (terminate) signal:

kill process_id

  • List available signal names (to be used without the SIG prefix):

kill -l

  • Terminate a program using the SIGHUP (hang up) signal. Many daemons will reload instead of terminating:

kill -1|HUP process_id

  • Terminate a program using the SIGINT (interrupt) signal. This is typically initiated by the user pressing Ctrl + C:

kill -2|INT process_id

  • Signal the operating system to immediately terminate a program (which gets no chance to capture the signal):

kill -9|KILL process_id

  • Signal the operating system to pause a program until a SIGCONT ("continue") signal is received:

kill -17|STOP process_id

  • Send a SIGUSR1 signal to all processes with the given GID (group id):

kill -SIGUSR1 -group_id

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