The command line to execute optimUMTS is as follows:
optimumts
Possibly, the real name of your executable might vary, e.g., the demonstration version is usually distributed with the name optimumts_demo.
On a Unix platform optimUMTS may output certain status information to the controlling shell until the graphical user interface has been launched. No input is read from this shell. optimUMTS forks a new process, so the controlling shell looses control over the job.