       kill ?-pgroup ?signal? idlist

              Send a signal to the each process in the list idlist, if permit-
              ted.  Signal, if present, is the signal number or  the  symbolic
              name of the signal, see the signal system call manual page.  The
              leading ``SIG'' is optional when the signal is specified by  its
              symbolic name.  The default for signo is 15, SIGTERM.

              If  -pgroup is specified, the numbers in idlist are take as pro-
              cess group ids and the signal is sent to all of the  process  in
              that  process group.  A process group id of 0 specifies the cur-
              rent process group.

              On Windows, the kill command is capable of  terminating  a  pro-
              cess, but not of sending an arbitrary signal.
