I am writing a series of scripts for exiftool and am trying to use the -p (lowercase p) option. When I use it by itself, it works perfectly. If I add any other operations to it (e.g. adding a keyword), no output happens. Am I using this correctly? Examples below;

1) $ exiftool -p 'File $FileName was created on $DateTimeOriginal' *.CR2
File IMG_9510.CR2 was created on 2008:02:24 10:17:01

2) $ exiftool -p 'File $FileName was created on $DateTimeOriginal' -keywords+="testkeyword" *.CR2
1 image files updated

I've tried moving the -keywords option *before* the -p option with the same results. I'd like to be able to have some terse logging (not the -v output)...

Thoughts?

-paul.