Sort files into folders by month number. Pass file name pattern in a parameter in quotes e.g. '*.jpg'.

file_sort_month_num.sh

#!/bin/bash

months=(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
monthNums='01 02 03 04 05 06 07 08 09 10 11 12'
echo $monthNums | xargs mkdir

i=0
for monthNum in $monthNums
do
  ls -l $1 | grep ${months[$i]} | awk '{print $NF}' | xargs -I {} mv {} ./$monthNum 
  let "i++"
done