File: readwrite003.hs

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import System.IO

file = "readwrite003.txt"

main = do
  writeFile file "ab\ncd\nef\ngh"
  h <- openFile file ReadWriteMode
  hGetLine h
  hPutStrLn h "yz"
  hClose h
  h <- openBinaryFile file ReadMode
  hGetContents h >>= putStr