UNIX for Dummies Questions & Answers

I need to find what users are currently logged onto the system that is easy just a simple who | awk '{ print $1 }' (thats all I need for the part), but I also need to find how long they have been logged on and the total amount of file space they are using.

Thanks in advance, I have been looking in my book/web for answers to the second parts and couldn't find any. Either that or I just overlooked it.

Take a look at the "last" command. It will report who is logged in, if they're currently logged on, and will report the total time they were logged in.
As for diskuse, if your users are restricted to keeping their files in their $HOME, it's easy to run a du /home/login_name to find their disk usage. If you're using disk quota's, its even easier. Otherwise you'll need to run "find" and look for all files owned by user and sum up their total usage.

Thanks a bunch. If I have any other questions I will be sure to ask.

To get the login time from "who". It also gives idle time but you would need to do some shell arithmetic to work out how long they have been logged in.
who -u