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Using fdupes to report on duplicate files, or even remove them automatically, is excellent. However, sometimes just working on a subset of the files can be done in 10% of the time and result in a 90% cleanup.
fdupesGreatestSavings is a perl script that takes the output of fdupes (on stdin) and determines which entries will result in the greatest savings, whether it is 100 copies of a 1 Meg file or 2 copies of a 20G file. The output is sorted by greatest savings to least.
fdupesGreatestSavings takes one parameter, the number of entries to display. It accepts input from stdin and sends output to stdout, so it is a filter.
fdupes must be run with only the flags --recurse and --size, though
--recurse is optional.
The following command will look through the entire file system on a Unix machine and report the top 10 duplicates it finds.
fdupes --recurse --size / | ./fdupesGreatestSavings 10If you want to save the results (for other procesing), you could do something like
fdupes --recurse --size /path/to/be/checked > /tmp/duplicate_filesfdupesGreatestSavings 100 < /tmp/duplicate_files > /tmp/fdupe.savingsScript is available via subversion at
svn co http://svn.dailydata.net/svn/sysadmin_scripts/trunk/fdupesThe only bug I have found so far is that the count of the number of files is incorrect (always 2), and I haven't tracked it down. Total space used by an entry is correct, however.