https://man7.org/linux/man-pages/man8/systemd-update-utmp.8.html
systemd-update-utmp.service(8) - Linux manual page
linux manualsystemdupdateutmpservice
https://cygwin.com/pipermail/cygwin/2000-April/034589.html
/var/run/utmp
var runutmp
https://cygwin.com/pipermail/cygwin/2001-June/055660.html
users or who /var/run/utmp
var runusersutmp
https://www.veritas.com/content/support/en_US/doc/129705091-129705095-0/uxrt-731_v110563616-129705095
Agent reports incorrect state if VCS is not set to start automatically and utmp file is empty...
https://en.wikipedia.org/wiki/Utmp
utmp - Wikipedia
utmpwikipedia