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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`).