I use this, forcibly kill, no logging, never errors, works on mac and linux:

    kill -9 "$(lsof -t -i:5000)" &>/dev/null || true

I like how the install script alone for this tool is much longer than the bash-ism

… and its answer is wrong, for reasons discussed in the very many other threads on this post that suggest this same snippet.

(On my laptop, this kills stern, Chrome, Slack, Firefox, and 1Pass…)