combine commands

[instigator]

How can I join this two commands into one single line?
exiftool -IPTC:keywords+={$keyword} -overwrite_original prueba.jpg  
exiftool "-Exif:copyright<${keywords}" -overwrite_original prueba.jpg
so exiftool don't run two times.

[Phil Harvey]

exiftool -IPTC:keywords+={$keyword} "-Exif:copyright<${keywords}, {$keyword}" -overwrite_original prueba.jpg

- Phil

[instigator]

Thanks.
And other question
Can I add a keyword(example: "word") only if "word" is not already a keyword?

[Phil Harvey]

Can I add a keyword(example: "word") only if "word" is not already a keyword?

Yes.  There is a not-very-intuitive yet obvious-by-hindsight technique for doing this which is mentioned in FAQ number 17.

- Phil