Rename files and use their date

rename-files-with-date.sh

#!/bin/bash
# Copy MP3 files in a directory to a new name based solely on creation date
# FROM: foo.mp3  Created on: 2012-04-18 18:51:44
# TO:    20120418_185144.mp3
for i in *.mp3
do
#  mod_date=$(stat -c "%y" "$i"|sed 's/\..*$//')
#  mod_date=$(stat -c "%y" "$i"|awk '{print $1"_"$2}'|sed 's/\..*$//')
mod_date=$(stat --format %y "$i"|awk '{print $1"_"$2}'|cut -f1 -d'.'|sed 's/[: -]//g')
 cp "$i" "$mod_date".mp3
done