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  1. or download this
    $octetstr = join '', map chr(), 0xab, 0xcd, 0x00, 0x1d, 0x94, 0x56;;
    
  2. or download this
    val = ''; 
    map { $val .= sprintf("%02x",$_) } unpack "CCCCCC", $octetstr;;
    ...
    
    print $mac;;
    ab:cd:00:1d:94:56
    
  3. or download this
    $mac = join ':', unpack '(H2)*', $octetstr;;
    
    print $mac;;
    ab:cd:00:1d:94:56