Avoiding duplicate keywords?

[chall_de]

Hello,

I'm a real beginner with ExifTool and I have the following problem:

I want to add the keyword "People" to an image but only if the keyword does not exist.
I have tried the following command but if I use it multiple I get duplicates.

exiftool -P "-keywords+=People" "E:\Test\0012.TIF"

How can I realize this?

Thanks in advance

Christian

[Phil Harvey]

Hi Christian,

FAQ 17 explains how to do this.

- Phil