Collecting the output of an external command using OCaml
You want Unix.open_process_in, which is described on page 388 of the OCaml system manual, version 3.10.
For Lwt,
val pread : ?env:string array -> command -> string Lwt.t
seems to be a good contender. Documentation here: http://ocsigen.org/docu/1.3.0/Lwt_process.html
let process_output_to_list2 = fun command -> let chan = Unix.open_process_in command in let res = ref ([] : string list) in let rec process_otl_aux () = let e = input_line chan in res := e::!res; process_otl_aux() in try process_otl_aux () with End_of_file -> let stat = Unix.close_process_in chan in (List.rev !res,stat)let cmd_to_list command = let (l,_) = process_output_to_list2 command in l