DESCRIPTION
 The 
kill utility sends a signal to the process(es) specified by the pid operand(s).
Only the super-user may send signals to other users' processes.
The options are as follows:
- 
-s signal_name
- 
A symbolic signal name specifying the signal to be sent instead of the default TERM.
- 
-l [exit_status]
- 
Display the name of the signal corresponding to exit_status. exit_status may be the exit status of a command killed by a signal (see the special sh(1) parameter ‘?’) or a signal number.
If no operand is given, display the names of all the signals. 
- 
-signal_name
- 
A symbolic signal name specifying the signal to be sent instead of the default TERM.
- 
-signal_number
- 
A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.
The following pids have special meanings:
- 
-1
- 
If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.
- 
0
- 
Broadcast the signal to all processes in the current process group belonging to the user.
Some of the more commonly used signals:
- 
1
- 
HUP (hang up)
- 
2
- 
INT (interrupt)
- 
3
- 
QUIT (quit)
- 
6
- 
ABRT (abort)
- 
9
- 
KILL (non-catchable, non-ignorable kill)
- 
14
- 
ALRM (alarm clock)
- 
15
- 
TERM (software termination signal)
kill is a built-in to csh(1); it allows job specifiers of the form ``%...'' as arguments so process id's are not as often used as kill arguments. See csh(1) for details.