Check open port for program in Linux (Video)

Really need to share with you guys,

So how do you list the network open ports on your Linux server and the process that owns them? The answer is simple. Use the following command (must be run as the root user):

sudo lsof -i
sudo netstat -lptu
sudo netstat -tulpn

Sample outputs (see video demo):

Credit to: www.cyberciti.biz