Hi Rolf,

You need to create a pipe, have the process write into one end of it, and read
data off the other end. The function [Unix.open_process_in] does that for
you. Here is an example:

  let one_liner command =
    let channel = Unix.open_process_in command in
    let line = input_line channel in
    let _ = Unix.close_process_in channel in
    line
  ;;

-- 
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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