Red Hat journalctl
From MyWiki
journalctl -b
journalctl -b -1
journalctl --list-boots
journalctl --since "1 hour ago"
journalctl --since "2 days ago"
journalctl --since "2015-06-26 23:15:00" --until "2015-06-26 23:20:00"
journalctl -u nginx.service
journalctl -u nginx.service -u mysql.service
