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  1. or download this
    # will need adjustment if you want to do negative values
    # kbstring(1024) => 1KB
    ...
      }
      return sprintf '%.2fdsB', $value, $prefix[0];
    }
    
  2. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
    .q>.<4-KI<l|2$<6%s!<qn#F<>;$,
    .=pack'N*',"@{[unpack'C*',$_]
    }"for split/</;$_=$,,y[A-Z a-z]
             {}cd;print lc