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  1. or download this
    >perl -E"say sprintf '%vX', pack 'd>', $ARGV[0]" 0.1
3F.B9.99.99.99.99.99.9A
  2. or download this
    $ perl -E'say sprintf "%vX", pack "d>", $ARGV[0]', 0.1
3F.B9.99.99.99.99.99.9A