Convert RAW to JPG

Install prereq's

sudo apt install imagemagick dcraw

Convert a single image from canon CR2 raw format to JPG:

dcraw -c -a -h ./IMG_123456.CR2 | ppmtojpeg > IMG_123456.jpg

Convert many canon CR2 raw format photos to JPG:

for i in *.CR2; do 
    dcraw -c -a -h $i | ppmtojpeg > $i.jpg;
    echo $i
done