You may be looking for the Unix.create_process function: https://ocaml.org/releases/4.11/htmlman/libref/Unix.html#1_Highlevelprocessandredirectionmanagement On Wed, Jan 6, 2021 at 3:05 PM Markus Elfring wrote: > Hello, > > The programming language “OCaml” supports also to start a background > process > by the function “Unix.system”. > How can the corresponding process identification be determined? > > I would appreciate your advices. > > Regards, > Markus >