ufw

List application profiles registered with ufw

ufw app list

Enable the firewall

ufw enable

Check status

ufw status verbose

Find a rule and delete it

sudo ufw status numbered
sudo ufw delete 2

Sample commands when setting up a new server

sudo ufw status verbose
sudo ufw app list
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow ssh
sudo ufw enable
sudo ufw status verbose