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sub main_script()
...

}

sub start_child()
...
    # In child process
    exec("child script", args);
}

foreach (@child_pids)
...
    kill "SIGTERM", $_;
}

while(waitpid(...))
{
   # Reap the children
}

debug2: client_process_control: accepted tty 0, subsys 0, cmd /usr/lev
+el1/sw/tmcvay/bin/PWL
...
debug1: Exit status -1
# _waitpid(3389) => pid: 3389, rc: