The who command is used to see who is currently logged in to your computer
and to see who has logged on recently last is the command.
Technical Geek Site
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To check who login your server with more option, use the below link.
http://www.2daygeek.com/how-to-check-who-is-logged-in-on-your-linux-server/
Sure Buddy…We will change the Header image soon
Very cool website, but you must improve your header graphics.