In the output of mailutil below, the "prune mailbox of ..." should be exchanged with "copy/move messages to existing mailbox" line so the help text corresponds to the correct command.
$ mailutil
usage: mailutil check [-debug] [-verbose] [mailbox]
;; report number of messages and new messages
mailutil create [-debug] [-verbose] new_mailbox
;; create new mailbox
mailutil delete [-debug] [-verbose] mailbox
;; delete existing mailbox
mailutil rename [-debug] [-verbose] source destination
;; rename mailbox to a new name
mailutil (copy | move) [-debug] [-verbose] old_mailbox new_mailbox
;; create new mailbox and copy/move messages
mailutil (append | appenddelete) [-debug] [-verbose] source destination
;; prune mailbox of messages matching criteria
mailutil prune [-debug] [-verbose] mailbox search_criteria
;; copy/move messages to existing mailbox
mailutil transfer [-debug] [-verbose] [-merge mode] source destination
;; make copy of source hierarchy to destination
;; -merge modes are prompt, append, or suffix=xxxx--
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