I'd expect a linux server administrator to know how to do that already or at least find out in a more efficient manner. Try the du command with a depth of 1 and sort the output numerically. Do that from the root directory and work your way down starting with the directory taking up the most amount of space. (Hint it's usually a log file that isn't rotating frequently enough, possibly in the /var directory).
Last edited by wstewart90; 04-29-2014 at 08:38 AM.