sudo lsof -i -P -n | grep LISTEN // list open ports
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i:22 // see a specific port such as 22 with PID USER FD TYPE DEVICE NODE NAME
sudo nmap -sTU -O IP-address-Here
https://www.cyberciti.biz/faq/unix-linux-check-if-port-is-in-use-command/
sudo kill `sudo lsof -t -i:3000` // kill process on port 3000
https://stackoverflow.com/questions/9346211/how-to-kill-a-process-on-a-port-on-ubuntu
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