[Demosthenex]

I've begun to use Calibre to manage my collection of IBM Redbooks. They are publicly available, and frequently change.

I currently have a shell script that remembers the source URL for a particular PDF, and I refresh my local copy at long intervals to keep up to date. It is a manual process, I just don't have to navigate the website and manage downloads.

Is there a way to have Calibre fetch a PDF from a source URL, and remember it in metadata to facilitate refreshing the copy later? Manually initiated is fine, like a "check for newer version" button for an ebook.

Thanks!