sudo lsof -i:22
sudo lsof -i:<port_number>
sudo ss -lptn 'sport = :80'
$ sudo ss -lptn 'sport = :80' State Local Address:Port Peer Address:Port LISTEN 127.0.0.1:80 *:* users:(("nginx",pid=125004,fd=12)) LISTEN ::1:80 :::* users:(("nginx",pid=125004,fd=11))
active port