Kapitel 4: Ein- und Ausgabe

hugs Echo
ghc -o myecho Echo.lhs

> import System

> main				:: IO ()
> main                          =  getArgs >>= echo

> echo				:: [String] -> IO ()
> echo []                       =  return ()
> echo ("-n" : x)               =  putStr   (unwords x)
> echo x                        =  putStrLn (unwords x)