because 1. it's a nicer UI that does the same thing. 2. the goal of the tool was to be minimal, useful, and a way to show off Haskell's ability to be able to w

because 1. it's a nicer UI that does the same thing. 2. the goal of the tool was to be minimal, useful, and a way to show off Haskell's ability to be able to write real world code that beginners can understand. 3. (personal opinion) Haskell is way more maintainable than bash is, any day of the week.