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oconnor663/gist:3878147

Created October 12, 2012 08:49
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nl.hs
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gistfile1.txt
import System.Environment
import Control.Monad
addNumbers strs = zipWith (\a b -> show a ++ " " ++ b) [1..] strs
main = do
args <- getArgs
text <- if length args > 0
then readFile (head args)
else getContents
putStr $ unlines $ addNumbers $ lines text
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