Cleans up cruft that accumulates in some of my media folders

cleanup.sh

#!/bin/bash
set -x

dir="${1:-./}"
if [ ! -z "${dir}" ]
then
  find "${dir}" -regex '.*[\.-_][Ss]ample[\.-_].*' -delete
  find "${dir}" -regex '.*proof.*\.jpg' -delete
  find "${dir}" -regex '.*\/screen[0-9]+\.png' -delete
  find "${dir}" -regex '.*\.\(exe\|idx\|nfo\|lnk\|nzb\|sfv\|srr\|srs\|srt\|sub\|sup\|txt\|url\)' -delete
  find "${dir}" -depth -mindepth 2 -type d -empty -delete
  chgrp -R media "${dir}"
  chmod -R ug=rwX,o=rX "${dir}"
fi