Automate arranging files into folders based on beginning of file name?
for i in {10..99}
do
    mkdir 000$i
    mv 000$i* 000$i
done

for i in {100..999}
do
    mkdir 00$i
    mv 00$i* 00$i
done

for i in {1000..9999}
do
    mkdir 0$i
    mv 0$i* 0$i
done


This bash script should work for 10-9999 directories.