Executing a system command in Haskell

Question

How could I execute a system command such as cp somefile somedestination in Haskell?

Something like an os.Exec.

Answer 1

The Haskell 98 standard provides:

System.system :: String
              -> IO GHC.IO.Exception.ExitCode

which executes a command.

The new System.Process library is more useful though, allowing for portable input/output redirection and so forth.