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duff,fdupesandrmlint, and strongly recommend readers to look at the third of these. It has an excellent option set (and documentation). With it, I was able to avoid a lot of the post-processing I needed to use with the other tools.install.shfiles can be found on an active system? I can't count the number of times I've saved a file and had name clash, with some on-the-fly renaming to save it. Flip side: no idea how many times I've downloaded something from different sources, on different days, only to find they are the same file with different names. (Which also kills the timestamp reliability.) 1: Size, 2: Digest, 3: Byte contents.