code: def main(argString=None):
      
      # 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))
  
      # Compute frequency using plink
      logger.info("Computing the frequencies using Plink")
      computeFrequency(args)
  
      # Read the freqency file
      logger.info("Flagging SNPs with MAF = 0")
      findSnpWithMaf0(args.out + ".frq", args.out)
docs: The main function.
  
      :param argString: the options.
  
      :type argString: list
  
      These are the steps:
  
      1. Prints the options.
      2. Computes the frequencies using Plinl (:py:func:`computeFrequency`).
      3. Finds markers with MAF of 0, and saves them in a file
         (:py:func:`findSnpWithMaf0`).