def load_alias_hash(self):
        """
        Load (create, if not exist) the alias hash file.
        """
        # w+ creates the alias hash file if it does not exist
        open_mode = 'r+' if os.path.exists(GLOBAL_ALIAS_HASH_PATH) else 'w+'
        with open(GLOBAL_ALIAS_HASH_PATH, open_mode) as alias_config_hash_file:
            self.alias_config_hash = alias_config_hash_file.read()
Load (create, if not exist) the alias hash file.