So today I learned about find -exec ... +

$ mkdir 1 2 3 4 $ for d in 1 2 3 4 ; do touch $d/{a,b} ; done $ find -type f -exec echo {} ; ./2/b ./2/a ./4/b ./4/a ./1/b ./1/a ./3/b ./3/a $ find -type f -exec echo {} + ./2/b ./2/a ./4/b ./4/a ./1/b ./1/a ./3/b ./3/a

… sweet!