Executing a system command in Haskell

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

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Something like an os.Exec.

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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.

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import System.Process

main = callCommand "cp somefile somedestination"

just works, but you may prefer other functions from the System.Process module.

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I'm not a haskell buff, but this may be what you're looking for

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If you do this sort of thing a lot then it's worth having a look at http://hackage.haskell.org/package/HSH.