Read until end of stream in haskell

Question

I\'m fairly new to Haskell, and I\'d like to keep reading lines from the console until the end of the stream, and outputting everything I get in upper case. So far, I\'ve got

Answer 1

This goes way beyond what you're really asking for, but I use this pattern a lot: interact:

myFun :: String -> String
myFun = ...

main = interact (unlines . myFun . lines)

Your function myFun will be executed against every line of standard input and the result sent to standard output.