Simple bash script to recursively delete files and folders based on date and freespace

This simple script will automatically free diskspace if the diskspace in the targeted area (specified by $FREEDIR) exceeds the specified limit ($LIMIT). It  will then proceed with recursively removing the oldest file/folder until the used diskpace no longer exceeds the limit.

#!/bin/bash

#CONFIG####################################################

#the dir u wish to watch
FREEDIR="/home/rtorrent/download"

#the limit in percent
LIMIT=90

###########################################################

while [ true ]; do
  USAGE=`df $FREEDIR | tail -1 | awk {'print $4'}`
  USAGE=${USAGE:0:${#USAGE}-1}

  if [ $USAGE -gt $LIMIT ]; then
    TODELETE=$FREEDIR/`ls -tA $FREEDIR | tail -1`
    echo "Removing: $TODELETE"
    rm -rf "$TODELETE"
  else
    break
  fi
done

exit 0