unless (setrlimit(RLIMIT_CPU, 50, 50) ) {
        print STDERR "Cannot set RLIMIT_CPU!\n";
        exit;
      }
      unless (setrlimit(RLIMIT_NPROC, 40, 40) ) {
        print STDERR "Cannot set RLIMIT_NPROC!\n";
        exit;
      }
      unless (setrlimit(RLIMIT_NOFILE, 50, 50) ) {
        print STDERR "Cannot set RLIMIT_OPEN_MAX!\n";
        exit;
      }
      unless (setrlimit(RLIMIT_OPEN_MAX, 50, 50) ) {
        print STDERR "Cannot set RLIMIT_OPEN_MAX!\n";
        exit;
      }
      unless (setrlimit(RLIMIT_DATA, 1024*1024*30, 1024*1024*30) ) {
        print STDERR "Can not extend data segment limit!\n";
        exit;
      }
      unless (setpriority(0, 10)) {
        print STDERR "Cannot set Priority!\n";
        exit;
      }

      ....

      START EXTERNAL BASH SCRIPT