Calling an external command from a Haskell program

[Simon Marlow]

> PS. why the differences in default access to standard modules?
>     should GHC be more restrictive there?

No, this is a feature.  See

  http://www.haskell.org/ghc/docs/latest/html/users_guide/x1097.html#GHCI-SCOPE

in particular section 3.4.1.1.

Cheers,
	Simon