code: public function actionFlush()
      {
          $cachesInput = func_get_args();
  
          if (empty($cachesInput)) {
              throw new Exception('You should specify cache components names');
          }
  
          $caches = $this->findCaches($cachesInput);
          $cachesInfo = [];
  
          $foundCaches = array_keys($caches);
          $notFoundCaches = array_diff($cachesInput, array_keys($caches));
  
          if ($notFoundCaches) {
              $this->notifyNotFoundCaches($notFoundCaches);
          }
  
          if (!$foundCaches) {
              $this->notifyNoCachesFound();
              return ExitCode::OK;
          }
  
          if (!$this->confirmFlush($foundCaches)) {
              return ExitCode::OK;
          }
  
          foreach ($caches as $name => $class) {
              $cachesInfo[] = [
                  'name' => $name,
                  'class' => $class,
                  'is_flushed' => $this->canBeFlushed($class) ? Yii::$app->get($name)->flush() : false,
              ];
          }
  
          $this->notifyFlushed($cachesInfo);
      }
docs: Flushes given cache components.
  
  For example,
  
  ```
  # flushes caches specified by their id: "first", "second", "third"
  yii cache/flush first second third
  ```