Find Duplicate Files (based on size first, then MD5 hash)

find-duplicates () { find "$@" -not -empty -type f -printf "%s\0" | sort -rnz | uniq -dz | xargs -0 -I{} -n1 find "$@" -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate; }
This is a modified version of the OP, wrapped into a bash function. This version handles newlines and other whitespace correctly, the original has problems with the thankfully rare case of newlines in the file names. It also allows checking an arbitrary number of directories against each other, which is nice when the directories that you think might have duplicates don't have a convenient common ancestor directory.

9 Alternatives + Submit Alt

  • This dup finder saves time by comparing size first, then md5sum, it doesn't delete anything, just lists them.


    73
    find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate
    syssyphus · 2009-09-21 00:24:14 23
  • If you have the fdupes command, you'll save a lot of typing. It can do recursive searches (-r,-R) and it allows you to interactively select which of the duplicate files found you wish to keep or delete.


    22
    fdupes -r .
    Vilemirth · 2011-02-19 17:02:30 0
  • Calculates md5 sum of files. sort (required for uniq to work). uniq based on only the hash. use cut ro remove the hash from the result.


    18
    find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33 | cut -c 35-
    infinull · 2009-08-04 07:05:12 1
  • Improvement of the command "Find Duplicate Files (based on size first, then MD5 hash)" when searching for duplicate files in a directory containing a subversion working copy. This way the (multiple dupicates) in the meta-information directories are ignored. Can easily be adopted for other VCS as well. For CVS i.e. change ".svn" into ".csv": find -type d -name ".csv" -prune -o -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type d -name ".csv" -prune -o -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate Show Sample Output


    2
    find -type d -name ".svn" -prune -o -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type d -name ".svn" -prune -o -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate
    2chg · 2010-01-28 09:45:29 0
  • This works on Mac OS X using the `md5` command instead of `md5sum`, which works similarly, but has a different output format. Note that this only prints the name of the duplicates, not the original file. This is handy because you can add `| xargs rm` to the end of the command to delete all the duplicates while leaving the original.


    2
    find . -type f -exec md5 '{}' ';' | sort | uniq -f 3 -d | sed -e "s/.*(\(.*\)).*/\1/"
    noahspurrier · 2012-01-14 08:54:12 4

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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