Put the tail inside the capturing parens.
OUTPUT=$(exif ... | tail -1)
You don’t need the double quotes here. I’m guessing that you
tried
OUTPUT="$(exif ...) | tail -1"
Put the tail inside the capturing parens.
OUTPUT=$(exif ... | tail -1)
You don’t need the double quotes here. I’m guessing that you
tried
OUTPUT="$(exif ...) | tail -1"