gnus-group-check-bogus-groups).gnus-group-find-new-groups). With 1
C-u, use the ask-server method to query
the server for new groups. With 2 C-u's, use most
complete method possible to query the server for new groups,
and subscribe the new groups as zombies.gnus-group-expire-articles).
That is, delete all expirable articles in the group that have
been around for a while. (see Expiring
Mail).gnus-group-expire-all-groups).