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Doing exiftool -Comment='This is a new comment' dst.jpg replaces any comment already present. How can I add the string instead?

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  • I am unfamiliar with that tool.. but could it be something as simple as using += instead of = ?
    – Kage
    Commented Aug 27, 2016 at 16:24
  • Nope, that's for adding items to a list-type tag.
    – Arch Stanton
    Commented Aug 28, 2016 at 9:23

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Use this:
exiftool '-Comment<$Comment Stuff added to comment' dst.jpg

Since you're copying a tag as well as adding stuff, you need to use the copy tag syntax "<" instead of the assign value syntax "=".

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  • Thank you! I am actually trying to use it in a bash function, but I can't get arguments to work: exiftool '-Comment<$Comment\n"$1"' doesn't work. Can you help me please?
    – Arch Stanton
    Commented Aug 28, 2016 at 10:36
  • Solved. I had to write '-Comment<$Comment$/'$1''.
    – Arch Stanton
    Commented Aug 28, 2016 at 13:51

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