linux list prorts listening 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 22

Example 2: check if port is running in ubuntu

# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # Port
sudo nmap -sTU -O IP-address-Here