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Silently is a package that allows you to run an IO action and prevent it from writing to stdout, or any other handle, by using "silence". Or you can capture the output for yourself using "capture".
For example; the program
import System.IO.Silently
main = do
putStr "putStrLn: " >> putStrLn "puppies!"
putStr "silenced: " >> silence (putStrLn "kittens!")
putStrLn ""
(captured, result) <- capture (putStr "wookies!" >> return 123)
putStr "captured: " >> putStrLn captured
putStr "returned: " >> putStrLn (show result)
will print
putStrLn: puppies!
captured: wookies!
returned: 123