The "who" utility should support wtmpdb. It no longer works when utmp support is disabled by systemd (the /var/run/utmp file no longer exists).
-- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)