exiftool "-filename<DateTimeOriginal" -d %Y-%m-%d-%H-%M-%S%%-c.%%e *.jpg *.JPG

#!/bin/bash

function usage {
	cat << __USAGE__
$(basename ${0}) is a tool for rename based on creation date.

Usage: 
	$(basename ${0}) [FILE]...
__USAGE__
}

if [ $# -gt 0 ]; then
	for i in `seq 1 $#`
	do
		CREATED=`GetFileInfo -d "$1"`
		CREATED_FILENAME=`echo ${CREATED} | sed -e 's!^\([0-9]\{2\}\)/\([0-9]\{2\}\)/\([0-9]\{4\}\) \([0-9]\{2\}\):\([0-9]\{2\}\):\([0-9]\{2\}\)!\3-\1-\2-\4-\5-\6!'`
		echo $1 "->" ${CREATED_FILENAME}.jpg
		mv "$1" ${CREATED_FILENAME}.jpg
		shift
	done
else
	usage
fi