w, who, users

s@ubuntu:~$ w
 07:13:00 up  3:07,  1 user,  load average: 0.38, 0.27, 0.27
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
s        tty7     :0               04:06    3:06m  8:32   0.38s /sbin/upstart -
s@ubuntu:~$ who
s        tty7         2019-05-22 04:06 (:0)
s@ubuntu:~$ users
s