-r,\ --rate-limit\ LIMIT\ \ \ download\ rate\ limit\ (e.g.\ 50k\ or\ 44.6m)
-R,\ --retries\ RETRIES\ \ \ \ number\ of\ retries\ (default\ is\ 10)
--dump-user-agent\ \ \ \ \ \ \ \ display\ the\ current\ browser\ identification
---user-agent\ None\ \ \ \ \ \ \ \ specify\ a\ custom\ user\ agent
+--user-agent\ UA\ \ \ \ \ \ \ \ \ \ specify\ a\ custom\ user\ agent
--list-extractors\ \ \ \ \ \ \ \ List\ all\ supported\ extractors\ and\ the\ URLs\ they
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ would\ handle
\f[]