In reply to irshad_mansur:
There is a way to get the entire command line using the VPI routine vpi_get_vlog_info(), and the UVM provides a very handy get_plusargs() that puts all of the +options into a queue of strings.
But even if you used one of these methods, there is no way of knowing which +options got used by $test$plusargs and $value$Plusargs and which ones didn’t.
My suggestion would be to use the get_plusargs() method instead of $test$plusargs and $value$Plusargs to retrieve all your test options and mark each option as they get used, or you can have a registry of options your test will use and compare the registry with the list when the test starts so it can immediately stop if there is any unused +options.