Rename image files to their creation date (unix timestamp) based on exif metadata

rename-to-exif-timestamp.sh

#!/bin/bash

# date: 2015-01-24
# purpose: Rename image files to their creation dates
# (unix timestamp) based on exif metadata

for file in *;
do
    tstmp=$(exiv2 "$file"\
     | grep -ia "image timestamp"\
     | perl -ne '@foo=split / /; print "$foo[-2]_$foo[-1]";'\
     | perl -ne 's/:/-/g; print;');

    # mv -v "$file" "$tstmp-$file";
    echo "$tstmp-$file";
done