LIST OVERVIEW.FMT

    The overview.fmt file is maintained by some news transport
    systems to contain the order in which header information
    is stored in the overview databases for each news group.
    When executed, news article header fields are displayed
    one line at a time in the order in which they are stored
    in the overview database[5] following the 215 response.
    When display is completed, the server will send a period
    on a line by itself. If the information is not available,
    the server will return the 503 response.

    Please note that if the header has the word "full" (without
    quotes) after the colon, the header's name is prepended
    to its field in the output returned by the server.

    Many newsreaders work better if Xref: is one of the optional fields.

    It is STRONGLY recommended that this command be implemented
    in any server that implements the XOVER command. See section
    2.8 for more details about the XOVER command.

2.1.7.1 Responses

        215 information follows
        503 program error, function not performed