return true, if tag does not exist or does not have a specific value

[c6y]

I'd like this to return true — if a tag doesn't exist OR if the value of the tag is not 'myname'.

See below for what I have. But I'm getting a false even if tag XMP-cc:AttributionName does not exist.

exiftool \
  -r \
  -if 'not $XMP-cc:AttributionName =~ /myname/' \
  -FileName \
  .

Thanks!

[StarGeek]

Try
-if 'not $XMP-cc:AttributionName =~ /myname/ or not defined $XMP-cc:AttributionName'

[Phil Harvey]

-if 'not $XMP-cc:AttributionName =~ /myname/ or not defined $XMP-cc:AttributionName'

I would recommend reversing the order since the =~ may fail if the tag is not defined:

-if 'not defined $XMP-cc:AttributionName or not $XMP-cc:AttributionName =~ /myname/'

- Phil

[c6y]

Big thanks Phil & StarGeek! I was not aware that OR could be used. Somehow I missed to find it on the documentation. And the order turned out to be relevant as well! Thanks again!

[Hayo Baan]

I would recommend reversing the order since the =~ may fail if the tag is not defined:

-if 'not defined $XMP-cc:AttributionName or not $XMP-cc:AttributionName =~ /myname/'

And while you're at it, change not $XMP-cc:AttributionName =~ /myname/ into $XMP-cc:AttributionName !~ /myname/

-if 'not defined $XMP-cc:AttributionName or $XMP-cc:AttributionName !~ /myname/'