I would like a command line option to print the current date somewhere on the page. Not the picture's EXIF date, the date that the page was printed. And, I need this as a command line option, because I would prefer not to set this as the global default behavior.

A header or footer would be fine. Obviously, this could be extended into other header/footer info, like filename, size, etc, etc. The date is what I need. I'm sure other people have a need for other info.