implement unix pipes in haskell

I'm writing a mini shell and although I've got most of it planned out, one thing I'm not sure how to do is implement piping the o开发者_开发百科utput of one program as the input of another. Is there a sample or something that can point me in the right direction?

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The RWH Book has a complete example of how to emulate piping in Haskell, IMO is one of the best examples of the book and it could be quite enlightening.

=> http://book.realworldhaskell.org/read/systems-programming-in-haskell.html#systems.piping

Good Luck.