Re: [Haskell-cafe] ghc -e with standard input

interact :: (String -> String) -> IO () is a very handy function for ghc -e, e.g. ghc -e 'interact $ lines . map (show . (*2) . read) . unlines' will multiply the number on every line by 2. (interact takes a function which maps from entire input to entire output) On 05/11/2007, Graham Fawcett wrote:

On Nov 5, 2007 1:46 PM, Maurí­cio wrote:

...

Hi,

Is there a way to run 'ghc -e' taking input from standard input? I would like to use it in a pipe.

It seems to me that you can use getContents, et. al., as you would from any other Haskell program:

$ echo hello there mauricio | ghc -e "print =<< (Control.Monad.liftM (reverse . words)) getContents" ["mauricio","there","hello"]

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