errors writing comment even though it works

[imthenachoman]

I have a bash script that is going through images and adding OR appending a comment. The command I am using is:

exiftool -comment="$fileNameOriginal" '-comment<$Comment '"$fileNameOriginal" -overwrite_original "$newFileName"

This is the output:

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Warning: [minor] Tag 'Comment' not defined - Photo 001.jpg
Warning: No writable tags set from Photo 001.jpg
    1 image files updated

However, when I check, the comment is there.

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$ exiftool -comment "$newFileName"
Comment                         : IMG 0001.jpg

I don't get the error if I run the command a second time.

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$ exiftool -comment="$fileNameOriginal" '-comment<$Comment '"$fileNameOriginal" -overwrite_original "$newFileName"
    1 image files updated

$ exiftool -comment "$newFileName"
Comment                         : IMG 0001.jpg IMG 0001.jpg


Any way to ignore that first error saying comment is not defined?

And what does that second error mean? Why would I get it if the comment was written?

[Phil Harvey]

You can ignore the minor warning with -m.

The other warning can only be ignored with -q -q, but that will also remove the informational messages.  It means that you were trying to copy tags from a file (the source file), but nothing was copied.  This will happen if comment doesn't already exist.

- Phil

[imthenachoman]

Got it. Thank you!