特定ディレクトリに書き出し続けるだけのスクリプト

#!/bin/bash
dirname=$1
limit=$2
interval=$3
cnt=0
for cnt in `seq 0 $limit`
do
cntpad=`printf "%09d" $cnt`
echo -n "$cntpad " > "$dirname"/"$cntpad".txt
date >> "$dirname"/"$cntpad".txt
cat "$dirname"/"$cntpad".txt > "$dirname"/lastfile.log.txt
cat "$dirname"/lastfile.log.txt >> "$dirname"/writing.log.txt
echo $cntpad
sleep $interval
cnt=`expr $cnt + 1`
done
exit 0