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  1. or download this
    $pid = open( my $fr_child, '-|', @cmd) 
                or die("Can't launch $cmd[0]: $!\n");
    
  2. or download this
    $pid = open( my $fr_child, '-|', $snmpCmd)
                or die("Can't launch $cmd[0]: $!\n");
    
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    Child exited successfully
    !!!! Illegal seek / 0 /
    
  4. or download this
            $pid = open( my $fr_child, $snmpCmd)
                or die("Can't launch $cmd[0]: $!\n");