title: Determine youtube-dl "completed" status without downloading?
body: <p>How can I determine from bash if youtube-dl still has work to do for a particular playlist WITHOUT downloading videos?  For example, if youtube-dl is used to CONTINUE downloading an existing playlist (for example, a Pluralsight course, a Youtube channel, etc.), youtube-dl loads the manifest and determines one-by-one if a video has already been downloaded.  I would like to use youtube-dl to determine if all of the videos have already been downloaded WITHOUT doing the actual download.  The goal is to mark the Pluralsight course or Youtube channel as "complete" so I may continue with other automated processing.</p>