Linux / Ubuntu show ports in use

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# How to check if port is in use in
- Run any one of the following command on Linux to see open ports:
sudo netstat -tulpn | grep LISTEN
-t - Show TCP ports.
-u - Show UDP ports.
-n - Show numerical addresses instead of resolving hosts.
-l - Show only listening ports.
-p - Show the PID and name of the listener’s process. This information is shown only if you run the command as root or sudo user.
or
sudo lsof -i -P -n | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i:22 ## see a specific port such as 22 ##
sudo nmap -sTU -O IP-address-Here

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