docs: def CheckForUnknownFiles(self):
  		"""Show an "are you sure?" prompt if there are unknown files."""
  		unknown_files = self.GetUnknownFiles()
  		if unknown_files:
  			print "The following files are not added to version control:"
  			for line in unknown_files:
  				print line
  			prompt = "Are you sure to continue?(y/N) "
  			answer = raw_input(prompt).strip()
  			if answer != "y":
  				ErrorExit("User aborted")