see using port ubuntu code example
Example 1: linux how to see ports in use
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22Example 2: linux see used ports
netstat -tulpnsudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22netstat -tulpn