[Haskell-cafe] "piping" to system call

Hi, assume I have a program taking input from stdin. How do I call it from Haskell while feeding to it a string as input. That is, I want a function like system' :: String -> String -> IO ExitCode such that system' cmd inp would be equivalent to first writing inp to a file, say "temp", and then calling system (cmd ++ " < temp") Of course, without actually creating that temporary file and having to clean it up afterwards. Does such a system' exist? Thanks, Janis. -- Dr. Janis Voigtlaender http://wwwtcs.inf.tu-dresden.de/~voigt/ mailto:voigt@tcs.inf.tu-dresden.de