[mstudio]

I sometimes leave a process running on a port for webdev and then try to open a new one resulting in the error, "Error: listen EADDRINUSE 0.0.0.0:NNN", e.g. 0.0.0.0:443.

There are many ways to search for the process, but here's what I use:

   lsof -iTCP -sTCP:LISTEN -P | grep [PORT NUMBER]

Look for port num and kill the process with:

   kill -9 [PID OF PROCESS YOU WANT TO KILL]

Note if running as root user, you will need to prepend the above commands with sudo