This function sends a signal to a list of processes.
The first element of the list must be the signal to send.
You may use a signal name in quotes (without a
SIG on the front).
The function returns the number of processes successfully signaled.
If the signal is negative, the function kills process groups instead
(On System V, a negative process
number will also kill process groups,
but that's not portable.)
$cnt = kill 1, $child1, $child2; kill 9, @goners; kill 'STOP', getppid; # Can *so* suspend my login shell...