Merge tags of duplicated images before removing them

[enboig]

I have to merge two libraries of images. I need a way to:
- Find duplicated files (some tools do this).
- Merge their tags (I have found no tool to make this).
- Delete duplicated images.

Does such a tool exists? I have no problem writing a bash script if necessary to achieve it in multiple steps.

Thanks

[Phil Harvey]

ExifTool can merge tags from two files.

I would find duplicate files like this (should work on Mac/Linux):

md5 `find DIR` | sort -k 4 | uniq -d -f 3

- Phil