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11 lines
205 B
Haskell
11 lines
205 B
Haskell
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module Main(main) where
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import System.Environment
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main :: IO ()
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main = do
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_:input:output:_ <- getArgs
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let f = map (\x -> if x == 'x' then 'y' else x)
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writeFile output . f =<< readFile input
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