hyperxmp-add-bytecount [options] filename.pdf...
hyperxmp-add-bytecount adds/updates the
byteCount specification in the XMP packet in a PDF file(s), with
byteCount = file size. The XMP packet needs to be of, or compatible with, the format produced from a document that uses the L A T E X hyperxmp package.
If no XMP packet of a compatible form is found in the PDF file, no change is made to the file.
Write usage summary and exit.
Output version information and exit.
Email bug reports to John Collins and/or Scott Pakin.