Freedup eliminates duplicate files using links and thus reduces the amount of used disk space within one or more file systems. Freedup searches all provided file system trees for identical files and links them together. If the devices differ, a symbolic link is used, otherwise a hard link by default. Many options allow you to modify the file comparison, the linking behavior, and the output. The input is either taken from external pipe input or from an internally generated pipe using find. License: GNU General Public License (GPL) Changes: This release provides runtime checks for hash functions and currently allows a fallback between SHA1, MD5, and SUM. If one or more executables are not in place, the most reliable available method is chosen. If none is present, the "-#" option is activated automatically. No further assertions should occur. Bugs were fixed for AIX and Cygwin. It turned out that the content of two files was not compared in certain situations. This was a general problem, currently seen under Cygwin only. The fix has been verified for Cygwin and Linux.

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