On ons, 2004-10-27 at 08:04, Aaron wrote: Short version: 1) Sort them (by binary content.) 2) Delete duplicates. 3) ... 4) Profit! :) I would probably only keep the path to the mp3 in the sorted structure, and then open (and close) them for comparison as needed. 'man qsort' is your friend. Step one: The compare() function, that you supply to qsort, should open two files and compare for equality until EOF (in which case they are equal) or return when and unequalty is found. The array you are sorting holds the paths to all of your candidate mp3s, which you have found by recursively traversing your partition(s) Step two: All the paths to the mp3s are sorted so that paths with equal content are next to each other. Go thru them once, using the same comparison function as before. For each equal pair delete the lowest ordered file. For each unequal pair move the lowest ordered file to a place where you would like to keep your mp3 collection. /jens