#!/bin/bash
# changes file extension JPG or jpeg to jpg

for i in *; do 
   ext=${i#*.}
#   echo "ext: $ext"
   if ( test $ext = jpeg  ||  test $ext = JPG  ) ; then
#      echo "$i is jpeg"
      echo "mv $i ${i%%.*}.jpg" | tee -a aaa.log
      mv $i ${i%%.*}.jpg
   fi
done