http://www.perlmonks.org?node_id=927120


in reply to Best way to kill a child process

You are probably running into the common problem where you are actually getting the $pid of the shell, from fork(), which is actually running your desired forked program. You need to kill the shell and all it's descendants. Try: 
use Proc::Killfam;

killfam 9, $pid;

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