1. See user login history
$ last: listing most recent logins by users.
$ last -a list the IP or name of the system from where the user logged in
2. Vied the currently logged in user
$ who: list logged in users and their process
$ users: only list the logged in users
3. Running procssses of logged in user
$ w : who is logged in and what they are doing now.
4. Others
$ uptime: tell how long the system has been running
$ id: display user and all group ids
$ free
$ du
$ df
$ env
$ ps
$ top
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