Is there a simple terminal command maybe to delete all actual data, all files but leave all the directories there? Including packages (.app) as directories?
-- You don't need to read this: The reason why is on my iPod Touch, whenever I ssh to /private/var/mobile/Applications to get an icon or something to change for a theme, I have to look through every folder to find the application, since they're all in their unique identifier folders (e.g. 2C053638-26FE-42DD-A235-30FCBA59E623), its impossible to find it. So I copied the Applications folder to my desktop, so I could spotlight search for the application name in it and then the folder that its in would be the unique id folder on the iPod, so having it sorted the same I could easily find it.