val hashtbl_sorted_fold :
('a -> 'b -> 'c -> 'c) -> ('a, 'b) Hashtbl.t -> 'c -> 'c
+val wget: ?output: string -> string -> unit
+val gzip: ?keep: bool -> string -> unit
+val gunzip: ?keep: bool -> string -> unit
+val tempfile: unit -> string
+
+val string_of_proc_status : Unix.process_status -> string
+