check open ports linux

open-ports.sh

How to check if port is in use in

To check the listening ports and applications on Linux:

    Open a terminal application i.e. shell prompt.
    Run any one of the following command on Linux to see open ports:
    sudo lsof -i -P -n | grep LISTEN
    sudo netstat -tulpn | 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
    For the latest version of Linux use the ss command. For example, ss -tulw