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

One "find" command only:

lst=$( find . -type f )
echo "$lst" | rev | cut -f 1 -d/ | rev | sort -f | uniq -i | while read f; do
   names=$( echo "$lst" | grep -i -- "/$f$" )
   n=$( echo "$names" | wc -l )
   [ $n -gt 1 ] && echo -e "Duplicates found ($n):\n$names"
done