efaq: Catching up in all newsgroups

 
 11.10 How do I catch up all newsgroups in Gnus?
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 In the ‘*Newsgroup*’ buffer, type ‘M-< C-x ( c y C-x ) M-0 C-x e’
 
    Leave off the initial ‘M-<’ if you only want to catch up from point
 to the end of the ‘*Newsgroup*’ buffer.