mythfilldatabase --do-channel-updates

[root@mythtv ~]# man mythfilldatabase

mythfilldatabase --help
usage:
--manual
   Run in manual channel configuration mode
   This will ask you questions about every channel

--update
   For running non-destructive updates on the database for
   users in xmltv zones that do not provide channel data
   Stops the addition of new channels and the changing of channel icons.

--preset
   Use it in case that you want to assign a preset number for
   each channel, useful for non US countries where people
   are used to assigning a sequenced number for each channel, i.e.:
   1->TVE1(S41), 2->La 2(SE18), 3->TV3(21), 4->Canal 33(60)...

--file <sourceid> <xmlfile>
   Bypass the grabbers and read data directly from a file
   <sourceid> = number of the video source to use with this file
   <xmlfile>  = file to read

--dd-file <sourceid> <offset> <lineupid> <xmlfile>
   <sourceid> = number of the video source to use with this file
   <offset>   = days from today that xmlfile defines
                (-1 means to replace all data, up to 10 days)
   <lineupid> = the lineup id
   <xmlfile>  = file to read

--xawchannels <sourceid> <xawtvrcfile>
   (--manual flag works in combination with this)
   Read channels as defined in xawtvrc file given
   <sourceid>    = cardinput
   <xawtvrcfile> = file to read

--do-channel-updates
   When using DataDirect, ask mythfilldatabase to
   overwrite channel names, frequencies, etc. with the
   values available from the data source. This will
   override custom channel names, which is why it is
   off by default.

--remove-new-channels
   When using DataDirect, ask mythfilldatabase to
   remove new channels (those not in the database)
   from the DataDirect lineup.  These channels are
   removed from the lineup as if you had done so
   via the DataDirect website's Lineup Wizard, but
   may be re-added manually and incorporated into
   MythTV by running mythfilldatabase without this
   option.  New channels are automatically removed
   for DVB and HDTV sources that use DataDirect.

--do-not-filter-new-channels
   Normally MythTV tries to avoid adding ATSC channels
   to NTSC channel lineups. This option restores the
   behaviour of adding every channel in the downloaded
   channel lineup to MythTV's lineup, in case MythTV's
   smarts fail you.

--graboptions <"options">
   Pass options to grabber. Do NOT use unless you know
   what you are doing. Mythfilldatabase will
   automatically use the correct options for xmltv
   compliant grabbers.

--sourceid <number>
   Only refresh data for sourceid given

--max-days <number>
   Force the maximum number of days, counting today,
   for the grabber to check for future listings
--only-update-channels
   Get as little listings data as possible to update channels
--refresh-today
--refresh-second
--refresh-all
--refresh-day <number>   (Only valid for selected grabbers: e.g. DataDirect)
   Force a refresh today, two days, every day, or a specific day from now,
   to catch the latest changes.  --refresh-all will update every day except
   the current day. To refresh today and all following days, XMLTV users
   should combine --refresh-today and --refresh-all.  Schedules Direct/
   DataDirect users should use --dd-grab-all.
--dont-refresh-tomorrow
   Tomorrow will always be refreshed unless this argument is used
--dont-refresh-tba
   "To be announced" programs will always be refreshed
   unless this argument is used

--dd-grab-all
   The DataDirect grabber will grab all available data
   in a single pull. This will ensure you always have
   the most up-to-date data, but requires significantly
   more CPU and RAM. It is not expected to work on all
   backend systems and with all lineups, and may
   interfere with recording due to resource starvation.

--export-icon-map [<filename>]
   Exports your current icon map to <filename> (default: iconmap.xml)
--import-icon-map [<filename>]
   Imports an icon map from <filename> (default: iconmap.xml)
--update-icon-map
   Updates icon map icons only
--reset-icon-map [all]
   Resets your icon map (pass all to reset channel icons as well)

--mark-repeats
   Marks any programs with a OriginalAirDate earlier
   than their start date as a repeat

-v or --verbose debug-level
   Use '-v help' for level info

--help
   This text


  --manual and --update cannot be used together.