[mythtv] Updating scheduled recordings from script

[Robert Kulagowski]

  mythbackend -help
Invalid argument: -help
Valid options are:
-l or --logfile filename       Writes STDERR and STDOUT messages to filename
-p or --pidfile filename       Write PID of mythbackend to filename
-d or --daemon                 Runs mythbackend as a daemon
-v or --verbose debug-level    Prints more information
                                Accepts any combination (separated by comma)
                                of all,none,quiet,record,playback,channel,
                                osd,file,schedule,network,commflag,audio,
                                libav,jobqueue
--printexpire                  List of auto-expire programs
--printsched                   Upcoming scheduled programs
--testsched                    Test run scheduler (ignore existing schedule)
--resched                      Force the scheduler to update
--nosched                      Do not perform any scheduling
--version                      Version information