The output is a list of file name pairs along with some other useful information. Samefile comes in handy when you - are notoriously low on disk space. It will probably find megabytes of redundant files that you can then hardlink, symlink or remove. The program is reasonably fast to even check any file against any other. Real time was about five times user plus system on an otherwise idle system.
Execution times reduce significantly if only files larger than some value are compared.
240 seconds real.