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  1. or download this
    system("perl script.pl >/dev/null &");
open(CMD, "|perl script.pl > /dev/null");
  2. or download this
    system("while true; do echo boo; sleep 2; done &");
print "system done - exiting\n";
  3. or download this
    open(CMD, "|while true; do echo boo; sleep 2; done");
print "open returned - exiting\n";