kill
Terminates a process
kill [option] PID-list
kill -l
The kill builtin 
terminates one or more processes by sending them signals. By default, kill sends software termination signals (signal number 15). The process must belong to the user executing kill, except that Superuser can terminate any process.
In the second form of the command, kill displays a list of all the available signal names. You can use either a signal number or the signal name with the kill builtin.
Arguments
The PID-list contains process identification (PID) numbers of processes kill is to terminate.
Options
You can specify a signal number or name, preceded by a hyphen, ...
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