If you already know the process id(s), and own the processes, the kill
builtin function might be of use.
From the doco:
kill SIGNAL, LIST
$cnt = kill 1, $child1, $child2
kill 9, @goners;
If SIGNAL is zero, no signal is sent to the process, but the
kill(2) system call will check whether it's possible to send
a signal to it (that means, to be brief, that the process is
owned by the same user, or we are the super user). This is
a useful way to check that a child process is alive.
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(8)As of 2017-01-24 23:16 GMT