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The output of your command "$ w -s" is:

 13:59:44 up 4 days, 13:42,  2 users,  load average: 0.04, 0.06, 0.02
USER     TTY      FROM               IDLE WHAT
wahid             192.168.254.125   2days sshd: wahid [priv]
wahid    tty2     -                 4days /usr/libexec/gnome-session-binary --session=ubuntu