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I have a PC running CentOS 6.4 and I was curious as to how long I was running this thing for. I ran the command uptime on the terminal and I saw how many days it was up for but then it said 2 users were on. I thought this may have been normal because I was logged into a regular account and I also had root access in the terminal. HOWEVER, after I exited a little while after I did it again and it said 3 users were logged in...whats going on is someone viewing my computer or something? I am the only user logged in
I would also recommend looking at the "w" and "last" commands, in addition to those suggested by chrism01. If you have multiple terminal windows open, those count as additional user logins, which may explain the behavior that you're seeing.