Find all folders in a directory with the same content

Question

In Ubuntu, is there any to find duplicate folders in a directory (i. e., folders with the same content)? I think there are already some command-line tools available for finding duplicate files (such as fdupes), but I want to find duplicate folders instead. That is, find folders which match in terms of the contents of the files they contain (though the filenames and other metadata might differ).

Answer 1

#!/bin/bash
shopt -s dotglob

for file in "$1"/*; do [[ -f "$file" ]] && d1+=( "$(md5sum < "$file")" ); done
for file in "$2"/*; do [[ -f "$file" ]] && d2+=( "$(md5sum < "$file")" ); done 

[[ "$(sort <<< "${d1[*]}")" == "$(sort <<< "${d2[*]}")" ]] && echo "Same" || echo "Different"

You can see it in action here:

$ mkdir 1 2
$ ./comparedirs 1 2
Same
$ cat > 1/1 <<< foo
$ cat > 2/1 <<< foo
$ ./comparedirs 1 2
Same
$ cat > 2/1 <<< bar
$ ./comparedirs 1 2
Different