smtp ports code example

Example 1: lsof port

$ lsof -i :port
# ex. lsof -i :3000

Example 2: gunicorn port 8080

mkdir .log 2> /dev/null
DEBUG=0 authbind gunicorn -b 0.0.0.0:80 backend:app --access-logfile .log/access.log --error-logfile .log/general.log