'This method is called when a user writes a command in the shell and hits
enter.
Recommendation: Overwrite this in your customized shells
Before calling this method, the framework calls the generic_user_input
method from the shell class.
:param command: The command to handle ( ie. "read", "exec", etc ).
:param parameters: A list with the parameters for @command
:return: The result of the command.'

def specific_user_input(self, command, parameters):

    pass
