#!/bin/sh

N_DEFAULT="$N"
if [ "$N_DEFAULT" = "" ] ; then N_DEFAULT=168 ; fi

while :
do
  for x in mp3dir*
  do
    read N <"$x/N"
    if [ "$N" = "" ] ; then N="$N_DEFAULT" ; fi
    (cd "$x" && ls -t | egrep ^t | egrep '\.mp3$' | tail -n +"$N" | xargs rm -v 2>/dev/null)
  done
  sleep 60
done