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  1. or download this
    echo 20000090fa173c04              | perl -lane 's/(..)/$1:/g && chop;
+ print'
  2. or download this
    echo 20000090fa173c04              | perl -lane 's/(..)/$1:/g && chop;
+ print lc'
  3. or download this
    echo 20000090fa173c04              | perl -lane 's/(..)/$1:/g && chop;
+ print uc'