find ./ -name "*.JPG" | awk -F "." '{print $2}' | xargs -i -t mv ./{}.JPG ./{}.jpg
find ./ -name "*.JPG" | awk -F "." '{print $2}' | xargs -i -t mv ./{}.JPG ./{}.jpg
find ./ -name "*.JPG" | awk -F "." '{print $2}' | xargs -i -t mv ./{}.JPG ./{}.jpg
find ./ -name "*.JPG" | awk -F "." '{print $2}' | xargs -i -t mv ./{}.JPG ./{}.jpg