-(defun gnus-group-delete-articles (group)
- "Delete all articles in the current group."
- (interactive (list (gnus-group-group-name)))
+(defun gnus-group-delete-articles (group &optional oldp)
+ "Delete all articles in the current group.
+If OLDP (the prefix), only delete articles that are \"old\",
+according to the expiry settings. Note that this will delete old
+not-expirable articles, too."
+ (interactive (list (gnus-group-group-name)
+ current-prefix-arg))