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2.13 Group Maintenance

b
Find bogus groups and delete them (gnus-group-check-bogus-groups).
F
Find new groups and process them (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.
C-c C-x
Run all expirable articles in the current group through the expiry process (if any) (gnus-group-expire-articles). That is, delete all expirable articles in the group that have been around for a while. (see Expiring Mail).
C-c C-M-x
Run all expirable articles in all groups through the expiry process (gnus-group-expire-all-groups).