dedup_rename.sh

#!/bin/bash

topdir=$(realpath "$1")
orig_path_dir="$topdir-orig_path"
tmp_dedup_dir="$topdir-tmp_dedup"

mkdir "$orig_path_dir"
mkdir "$tmp_dedup_dir"

cd $1
cnt=0;

find . -type f | while read -r filename ;
do
    cnt=$(($cnt+1));
    namefile="$cnt.${filename##*.}"
    namefile_path="$orig_path_dir/$namefile"
    dedup_file_path="$tmp_dedup_dir/$namefile"

    echo "$filename" > $namefile_path

    mv -v "$(cat $namefile_path)" "$dedup_file_path"
done