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

 18:34:20 up 30 days,  8:39,  4 users,  load average: 0.36, 0.88, 0.49
USER     TTY      FROM               IDLE WHAT
wahid    tty2     -                24days /usr/libexec/gnome-session-binary --session=ubuntu
wahid             192.168.254.125   8days sshd: wahid [priv]
wahid             192.168.254.125   8days sshd: wahid [priv]
wahid             192.168.254.125   8days sshd: wahid [priv]