#!/bin/bash
files=$(find [directory_path] -maxdepth 3 -mindepth 2 -type f) # files found two to three levels into given directory path
count=0
throttle=10

for file in $files
do
	count=$(($count+1))

	# Do some action here, followed by a &
	# for example: mv $file test_$file &

  let div="$count%$throttle"
 	if [[ $div -eq 0 ]]
	then
    wait;
	fi
done