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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! silenced: captured: wookies! returned: 123