How to delete duplicate files with fdupes?

You can do this if you want to run this silently (I've just used it to clear 150 GB of dupes running on rackspace block storage ..£kerching!!)

fdupes -rdN dir/

r - recursive
d - preserver first file, delete other dupes
N - run silently (no prompt)

fdupes has a rich CLI:

fdupes -r ./stuff > dupes.txt

Then, deleting the duplicates was as easy as checking dupes.txt and deleting the offending directories. fdupes also can prompt you to delete the duplicates as you go along.

fdupes -r /home/user > /home/user/duplicate.txt

Output of the command goes in duplicate.txt.

fdupes will compare the size and MD5 hash of the files to find duplicates.

Check the fdupes manpage for detailed usage info.