Linux System Admin Tool Box

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