def main(argString=None):
    """The main function of the module.

    :param argString: the options.

    :type argString: list

    These are the steps:

    1. Prints the options.
    2. Runs Plink with the ``geno`` option (:py:func:`runPlink`).
    3. Compares the two ``bim`` files (before and after the Plink ``geno``
       analysis) (:py:func:`compareBIM`).

    """
    # Getting and checking the options
    args = parseArgs(argString)
    checkArgs(args)

    logger.info("Options used:")
    for key, value in vars(args).iteritems():
        logger.info("  --{} {}".format(key.replace("_", "-"), value))

    # Run plink
    logger.info("Running Plink")
    runPlink(args)

    # Comparing the bim
    logger.info("Comparing BIM files")
    compareBIM(args)