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