kill
From NetBSD Wiki
The kill(1) command terminates or signals a process.
The PIDs of the processes to receive the signal are specified on the command line. An optional signal number or name can be specified following a '-'.
The following command will send signal 1 (SIGHUP) to process 234:
% kill -1 234
This variant has the same effect:
% kill -SIGHUP 234
If the signal number is omitted, the default of signal 15 (SIGTERM) is sent. This will normally terminate the receiving process.
% kill 234
While root can signal any process, regular users cannot send signals to processes owned by other users.
