I need a solution that allows me to control the time that each user spend on the computer, excluding idle time (some kind of parental control). I've tried timekpr, but it doesn't work on Ubuntu 13.10. pam_time is not what I'm looking for...
Here is how my situation looks like in practice:
There are several user's accounts in the system, let's call them U1, U2 and U3. I would like to know how long and at what time each of them was active, BUT if i. e. U2 doesn't perform any operations (just idle logged in) or lock his account without logging off, it shouldn't be counted against the total time spent by him on the computer. If user exceed the time limit assigned to his account, I would like to be able to run a bash script (and the same when he tried to use a computer in some specified hours).
My computer works as a server, so more than one user can use it at the same time. Users work in graphical mode (Unity, X Window System) without using the terminal.
Is there any third-hand software, a system command, some suggestions what can I use developing my own solution, et cetera?