check port open ubuntu code example
Example 1: linux how to see ports in use
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22
sudo nmap -sTU -O IP-address-Here
Example 2: how to check list of open ports in linux
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22
sudo nmap -sTU -O IP-address-Here
Example 3: ubuntu open port
sudo ufw allow 1191/tcp
Example 4: see what is using a port ubuntu
$ sudo lsof -i:22
Example 5: check what ports are open linux
sudo ss -tulw