Linux - How to find duplicate files

DD, I need to search for linux ubuntu in the home directory to find duplicate files, can you use a package or just a command? Thanks

REPLY

Here's how to find duplicate files in the / home directory, including subdirectories:
fdupes -r / home

Here's how to find duplicate files between two / home / user and / mnt / backup directories, including subdirectories:
fdupes -r / home / user / mnt / backup

With d you can delete duplicate files straight away, and S will display the size:
fdupes -rdS / home
As a result, it will ask you which file to keep (for example, 199 duplicates were found below):
Set 1 of 199, preserve files [1 - 2, all] (1848059712 bytes).
(1 = keep first, 2 = keep second, all = keep both)

The same thing that fdupes won't ask you if you want to delete the file:
fdupes -rdN / home

Another option is the diff tool, comparing two files and deleting the duplicate:
diff file1 file2 && rm file2

If you prefer a graphical interface, use fslint .

Other alternatives are:
rdfind
fslint (GUI)
dupeGuru (GUI)

REPLY

Then I needed some ultra fast search for (possible) duplicate files so that it wouldn't do sum (hash, md5 etc), which takes so much time. For this purpose I just wanted to look for duplicate files of the same size, which is now. I found this command and works flawlessly = returns only files that are the same size:

find /cesta/adresar -type f -printf "%10s\t%p\n" | sort --numeric | uniq --repeated --check-chars=10

Or duplicate by same name:
find /path/dir -mindepth 1 -printf '%h %f\n' | sort -t ' ' -k 2,2 | uniq -f 1 --all-repeated=separate | tr ' ' '/'