Alternative to Fing now that Fing has removed / hidden its CLI tool to show what computers are connected to one's current network.
https://itsfoss.com/how-to-find-what-devices-are-connected-to-network-in-ubuntu/
https://superuser.com/questions/124453/how-can-i-scan-the-local-network-for-connected-devices-mac-os
arp -a | grep -v '^?'