About scheduling LiveUpdate using the command line
You can use the command line to schedule LiveUpdate. LiveUpdate ensures that Symantec Protection Engine always has the most current definitions. You must create an empty file within the directory in which Symantec Protection Engine is installed. The empty file name must be LUNowFlag. Symantec Protection Engine periodically checks for this file and performs a LiveUpdate when this file is present. Symantec Protection Engine automatically removes the file before the LiveUpdate command runs.
You can choose to create the LUNowFlag file periodically by using schedulers. If you use Windows, you can use the standard Windows scheduler. On Solaris and Linux, you use the Unix cron scheduler.