Rename iPhone pictures by embedded timestamp and associated MOV video files

exif_rename_iphone_pics.sh

for fn in *.JPG; do
    echo "=> $fn"
    # get the timestamp from exif, format it accordingly
    ts=$(exiv2 -g DateTimeOriginal $fn | awk '{ts=$(NF-1)"_"$NF; gsub(":","",ts); print ts}')
    # retrieve the base name as well
    basen=${fn%.*}
    # rename the image, append its original name
    mv -i "$fn" "${ts}_$basen.jpg"
    # check if there is video file with the same name (live mode)
    if [ -f "$basen.MOV" ]; then
        # rename the video file to the same timestamp
        mv -i "$basen.MOV" "${ts}_$basen.mov"
    fi
done