Renaming Photos

Renaming file with its EXIF timestamp
$ exiv2 mv *.jpg

Renaming file with its Last Modified Timestamp
$ mv_pic.sh .

mv_pic.sh
# !/bin/sh
# Change file name with its Last Modified Timestamp#

# First we check for the argument
if [ -z "$1" ]; then
    echo "Usage: $0 directory"
    exit 1
fi

# Here we check if the argument is an absolute or relative path. It works both ways
case "${1}" in
  /*) work_dir=${1};;
  *) work_dir=${PWD}/${1};;
esac

# We need a for loop to treat file by file inside our target directory
for i in *; do
    modif_date=`stat -c %y "${work_dir}/${i}" | cut -d '.' -f1`
    mv "${work_dir}/${i}" "${work_dir}/${modif_date}.jpg"
done