I have a folder with many book files in different formats e.g. .txt, .epub, .rtf, etc.
Many of them are duplicates but have different names e.g.:
Brooks, Terry - Shannara 1 - The Sword of Shannara.txt
Brooks, Terry - Shannara 01 - The Sword of Shannara.txt
If I check these files with filemerge they are exactly the same file.
I have tried running several programs like Gemini on the folder in question with no results.
Every suggestion online seems to involve comparing two folders. I do NOT want to compare two folders. I only want to find the duplicate files within a directory or its sub-directories.
I was looking for a script or terminal command to loop through the folder(s) and show which files have the same content even though they may have different filenames, creation dates, modification dates, etc.
Any help would be much appreciated.
 - I should clarify that I want to find a way to compare two files even though they may be named differently but are of the same type. e.g. text files, or epub files. I do not wish to compare them between types a text file and an epub, of couse, would be different.