For note, Port’s are more for running with programs designed to work with your BEAM program, it’s less for running ‘other’ things as it doesn’t have this control over file descriptors, PID handling, or anything. If you want to manage programs that aren’t designed to be Port programs then I recommend using something like erlexec or so as it uses a shim C program to act as the binding layer between a Port call and Everything else.

You can also look at porcelain with or without goon plugin which despite its age still works well for me when I needed stdin control beyond what System.cmd can provide without digging into low-level Ports.

That said erlexec is better maintained and I found (but not tried) a more idiomatic Elixir wrapper for it exexec

There is also rambo which might come in handy as an alternative to porcelain and goon, as it’s wrapper does not use go and it’s runtime…