rencon is a simple, safe tool able to rename files based on their content.
Example usage:
rencon -m 'r_${hash}.${ext}' *.jpg
It will rename all .jpg files with a hash based on their content, and add "r_"
to distinguish them.
The default mask is ${hash}.${ext}. The hash used is SHA1.
For more information, run rencon -h.
It does not erase existing files.
While it can be used in that way it does not aim to do file deduplication.