permanent delete

I am wondering if i move a file to the trash and then empty trash, if that file is permanently deleted or is it stored somewhere deep in my comp? lol

I wonder this because some programs I have require that I delete via "terminal"

any way to completely delete it?
thanks

I've read up on it, and "secure empty trash" might be it? that means all this time the ones I've deleted via just emptying trash... where are they?

Yes AudMan you got the 'secure empty trash' right and if you wish you cqn be doubly sure by even erasing free hard drive disk space if is extremely critical by doing the following:-

How to Make Sure Deleted Data is GONE | Information Technology | Pepperdine University