ss - another util to investigate sockets

ss -nlp | grep 8080
    -l  listening ports
    -t  ??? tcp
    -u  ??? udp
    -n  more fine-tuned results
    -p  ???

sudo ss -tulpn | grep :6379

2018
https://www.cyberciti.biz/tips/linux-investigate-sockets-network-connections.html