Extract the creation date from an image and add the date to the filename. Only works on Mac.

rename_pics_date.sh

#!/bin/bash
#
# Extract the creation date from an image and add the date to the filename.
# Only works on Mac.
#

DUMP_DIR="/Users/family/pics/dump"
CP_DIR="/Users/family/pics/dated"

cd "$DUMP_DIR"
OLDIFS=$IFS
IFS=$'\n'
for file in $(ls); do
    date=$(mdls "$file" | grep "kMDItemContentCreationDate " | cut -d '=' -f 2 | cut -d ' ' -f 2)

    newfile=$(echo "$date-$file")
    echo "cp $file $CP_DIR/$newfile"
    cp "$file" "$CP_DIR/$newfile"
done

IFS=$OLDIFS