code: public function actionIndex($search)
      {
          $user = $this->finder->findUserByUsernameOrEmail($search);
          if ($user === null) {
              $this->stdout(\Yii::t('user', 'User is not found') . "\n", Console::FG_RED);
          } else {
              if ($user->confirm()) {
                  $this->stdout(\Yii::t('user', 'User has been confirmed') . "\n", Console::FG_GREEN);
              } else {
                  $this->stdout(\Yii::t('user', 'Error occurred while confirming user') . "\n", Console::FG_RED);
              }
          }
      }
docs: Confirms a user by setting confirmed_at field to current time.
  
  @param string $search Email or username