1. My Situation - I am using a second-hand Macbook running OSX version 10.8.3. - The OS was downloaded and so I do not have the CD the comes with it. - Most of the data on the laptop is junk (i.e stuff I don't need/want). - This includes (unneeded) applications, terminal commands, RAM data, files, etc., but mostly stuff in the 'Developer', 'bin' (and related), and 'Library' folders. 2. What I want - I want to erase everything but what I have grouped into one, specific folder, and the Operating System (of course). The general idea is that I will save/copy that folder to a USB drive and erase all the rest of the data - if possible, completely. 3. Considered Solutions - Manually deleting everything would be slow and impossible to complete. - Disk Utility's 'Zero Out Data' would be cool, but it doesn't work on Mountain Lion. - DBAN would be cool, but it would also delete the Operating System. 4. Questions a) Do you know any general working solutions for this? b) If I go in my terminal and double-hit 'tab', it prints: "Display all 1989 possibilities? (y or n)" meaning there are 1989 possible commands. Is there an efficient way to erase *generally all* the commands? c) Or to reset the root folder? Thank you in advance.