(flush [label...])
(Optional) A log or group label. If used, only points in this log or group will be flushed.
On success, t, otherwise one of the following error messages:
(error "textlog: Group or log label does not exist") (error "textlog: Too few arguments to flush: # < #") (error "textlog: Invalid command: flush")
or, if none of the above errors apply, nil.
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