[Haskell-cafe] Call external program and get stdout

[Roberto Zunino]

Allan Clark wrote:
>     -- Create the process
>  do (_pIn, pOut, pErr, handle) <- runInteractiveCommand command
>     -- Wait for the process to finish and store its exit code
>     exitCode <- waitForProcess handle

Warning: this will get stuck if the command output is so big that it
fills the SO buffers. This limit is 64K here.

Regards,
Zun.