code: def __File_Command_lineEdit_set_ui(self):
          
  
          # Adding settings key if it doesn't exists.
          self.__settings.get_key(self.__settings_section, "file_command").isNull() and \
          self.__settings.set_key(self.__settings_section, "file_command", self.__file_command)
  
          file_command = self.__settings.get_key(self.__settings_section, "file_command").toString()
          LOGGER.debug("> Setting '{0}' with value '{1}'.".format("File_Command_lineEdit",
                                                                  file_command))
          self.__file_command = file_command
          self.File_Command_lineEdit.setText(file_command)
docs: Fills **File_Command_lineEdit** Widget.