1- Login time - who command
2- Logout time - wtmp/utmp
3- what they were doing (which application they run and for how long) - top command
4- do they keep the box idle (just login and forget) - who command
5- do they utilize the machine or not - top command
To know more about those commands use man pages.
example: man wtmp
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by: oocytePosted on 2009-11-02 at 16:39:18ID: 25725232
I think psacct will do what you wanted. Check it out at:
ips/howto- log-user-a ctivity-us ing- proces s-accounti ng.html
http://www.cyberciti.biz/t