/**
  * COMMAND GETKEYS command
  * Available since 2.8.13.
  * Time complexity: O(N) where N is the number of arguments to the command
  * @link http://redis.io/commands/command-getkeys
  *
  * @param string $command
  * @return string[] List of keys from your command.
  */
 public function commandGetkeys($command)
 {
     return $this->returnCommand(['COMMAND', 'GETKEYS'], Parameter::command($command));
 }