Can the following questions be merged? These questions all look a lot similar and they all have valuable answers (most of which are similar, which is 'use fdupes'). Are we going to maintain a different question for
The third question is marked as a duplicate of the second, but the best answer is found in the third question (this is subjective I know). My personal favorite is this answer because it explains the basic options and has valuable notes (which might be edited into the answer).