原文：
If ping does not receive any reply packets at all it will exit with code 1.
If a packet count and deadline are both specified, and fewer than count packets are received by the time the deadline has arrived, it will also exit with code 1.
On other error it exits with code 2. Otherwise it exits with code 0. This makes it possible to use the exit code to see if a host is alive or not.

谷歌翻譯：
如果ping根本沒有收到任何回復數據包，它將退出代碼1。
如果指定了數據包計數和截止日期，并且在截止日期到達時收到的包數量少于計數數據包，則也會以代碼 1 退出。
在其他錯誤中，它與代碼2一起退出。否則它將退出代碼0。這使得使用退出代碼查看主機是否還活著成為可能。

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