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Best way to compare large files 20-80gB and report difference as a percentage,cygwin

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linux-howto

http://forums.fedoraforum.org – Have a windows system that has some large files on it. I need to compare these files, however instead of outputting the difference in lines, is there a way to output as a percentage. I have cygwin on this system. example, file1.ext is 65.1gB file2.ext is 65.2gB $diff --report-as-percentage-somehow file1.ext file2.ext $ output 18% different. (HowTos)