small bash script

#!/bin/bash
#laver m3u playlists af track feltet i id3 tags.

declare -a SONG
declare TRACK
declare -i I=0
#export I

for FIL in *.mp3; do
TRACK=`id3 -l "$FIL" |grep Track: |awk '{print $NF}'`
#echo $TRACK
SONG[ $TRACK ]="$FIL" 
echo SONG[$TRACK]=$FIL
I=$((I++)) #der er noget galt med denne linje
echo $I;
done
echo $I
exit 0