':param mutant: The mutant that is being analyzed.
:return: A tuple with the OS and the command separator
that was used to generate the mutant.'

def _get_os_separator(self, mutant):

    os = separator = None
    command_list = self._get_echo_commands()
    for comm in command_list:
        if (comm.get_command() in mutant.get_token_value()):
            os = comm.get_OS()
            separator = comm.get_separator()
    return (os, separator)
