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  1. or download this
    >perl -wle"print '1/2'+0"
Argument "1/2" isn't numeric in addition (+) at -e line 1.
...
>perl -wle"print '123/456'+0"
Argument "123/456" isn't numeric in addition (+) at -e line 1.
123
  2. or download this
    >perl -MMath::BigRat -wle"print Math::BigRat->new('1/2')->numify();"
0.5