move files

#!/bin/bash -x
typeset -g DIR=$1
typeset -ig files=$(ls -v ${DIR} | wc -l)
typeset -i i=1
for (( ; ; i++)); do
  mkdir -p 'Directory_'${i}
  if (( i * 5 >= files )); then break; fi
done
(( i = 1 ))
typeset -i j=0
find ${DIR} -type 'f' | sort -V |
while read; do
  mv -t 'Directory_'${i} ${REPLY}
  if (( ++j % 5 == 0 )); then (( i++ )); fi
done