PHP resizer sentinel

cacheSentinel.sh

#!/bin/bash 

CACHEDIR=
MAXSIZE=100
DIRSIZE=`du -s $CACHEDIR | cut -f 1`
MINFILES=5

echo $DIRSIZE' : '$CACHEDIR

#ls -t cache | sed -e '1,10d' | xargs -d '\n' rm

if [ $DIRSIZE -gt $MAXSIZE ]; then
   echo 'Removing files...'
   find $CACHEDIR -maxdepth 1 -mindepth 1 -printf '%T+ %p\n' | sort -r | tail -n +$MINFILES | xargs rm -rf
   echo 'Done'
fi