reorganize.sh

#!/bin/sh

count=0
IFS=$'\n'
for filename in `find *.txt`
do
    destDir="AAA$((count / 500 + 1))"
    if (($count % 500 == 0 ))
    then
	echo mkdir $destDir
	mkdir $destDir
    fi
    echo mv $filename $destDir
    mv $filename $destDir
    count=$((++count))
done