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Hacking - Determine if your computer is hacked

Show a listing of last logged in users

returns:

 22:14:53 up 9 days,  5:40,  1 user,  load average: 1.45, 1.52, 1.45
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
peter    :1       :1               17Nov20 ?xdm?  42:26m  0.00s /usr/lib/gdm3/gdm-x-session --run-script env GNOME_SHELL_SESSION_MODE=ubuntu /usr/bin/gnome-session --systemd --session=ubuntu

who

returns:

peter    :1           2020-11-17 16:34 (:1)