Forgotten stuff - when did I forget how to read man pages?
Convert a unix timestamp to a date string
date -d "@1234567" Thu Jan 15 12:56:07 AM CST 1970
Getting phantom users / stuck ssh sessions that have long since ended?
systemd logind seems to get confused under high load.
Try resetting things with: systemctl restart systemd-logind.service To verify what / who it was before the restart: loginctl list-sessions loginctl show-session xxxx