Terminate one or more process
You must own the process or be a privileged user.
This command is similar to the kill command that
is built into the Bourne, Korn, and C shells.
A minus sign before an
ID specifies a process group ID.
(The built-in version doesn't allow process group IDs,
but it does allow job IDs.)
List the signal names. (Used by itself.)
The signal number (from ps -f) or name (from kill -l). With a signal number of 9, the kill is absolute.