renames jpg files using exif creation date as filename in the same format as Dropbox Camera Uploads folder YYYY-MM-DD HH.MM.SS.jpg

rename-pictures-for-dropbox.sh

#!/bin/bash

# requires exif command line utility

shopt -s nocaseglob #find both *.jpg and *.JPG 

for i in *.JPG; do
  j=`exif -t 0x9003 "$i" | grep Value: | sed 's/Value://' | sed s/:/-/g | sed s/-/./3 | sed s/-/./3`.jpg
  mv -i "$i" "$j"
done