#!/bin/sh

# first find all used files and touch them (hope it's not massive amount of files)
[ -x /usr/bin/lsof ] && /usr/bin/lsof -w -l +d "${1}" | awk -- '{ if (NR > 1) { print $9; } }' | xargs -i touch -c {}

# find all files older then maxlifetime
find "${1}" -depth -mindepth 1 -maxdepth 1 -ignore_readdir_race -type f -cmin "+${2}" -delete