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  • As already mentioned, just finding duplicates and reporting them is not that hard and can be done with for instance fdupes or fslint. What is hard is to take action and clean up files based on that information. So say that the program reports that /home/yourname/vacation/london/img123.jpg and /home/yourname/camera_pictures/vacation/img123.jpg are identical. Which of those should you choose to keep and which one should you delete? To answer that question you need to consider all the other files in those two directories. Commented Apr 5, 2013 at 7:50
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    (continuing) Does .../camera_pictures/vacation contain all pictures from London and .../vacation/london was just a subset you showed to your neighbour? Or are all files in the london directory also present in the vacation directory? What I have really wanted for many years is a two pane file manager which could take file duplicate information as input to open the respective directories and show/mark which files are identical/different/unique. That would be a power tool. Commented Apr 5, 2013 at 7:58