def default_cmdline_options(config):
    """
    Return default command line options required for every run of terraform.

    Args:
        config: dictionary containing all variable settings required
                to run terraform with

    Returns:
        cmdline_options: list of command-line arguments to run
                         all terraform commands should be run with.
    """

    cmdline_options = ['-var=\'aws_region={}\''.format(config['aws_region']),
                       '-var-file={}'.format(config['tfvars']) ]

    return cmdline_options