51. In 2008, Torvalds stated that he used the Fedora Linux distribution because it comes first alphabetically, but because time has passed too long. 如果一个定时服务运行和失败可以发送一封电子邮件通知用户或管理员。这是可能的“OnFailure”节，指定如果服务失败时会发生什么。检测到故障时由一个非零的返回代码调用脚本。 为了这个，改变脚本如下: Among the Five Emperors' reigns, there are no transmitted records of people; it