How to find duplicate filenames (recursively) in a given directory? BASH

Question

I need to find every duplicate filenames in a given dir tree. I dont know, what dir tree user will give as a script argument, so I dont know the directory hierarchy. I tried thi

Answer 1

Here is my contribution (this just searches for a specific file type, pdfs in this case) but it does so recursively:

#!/usr/bin/env bash

find . -type f | while read filename; do
    filename=$(basename -- "$filename")
    extension="${filename##*.}"
    if [[ $extension == "pdf" ]]; then
        fileNameCount=`find . -iname "$filename" | wc -l`
        if [[ $fileNameCount -gt 1 ]]; then
            echo "File Name: $filename, count: $fileNameCount"
        fi
    fi
done