等待网络接口执行命令前 [英] Wait for Network Interface Before Executing Command

问题描述

我有我会如何实现这一目标一对夫妇的想法。不知道怎么会有我的脚本了。

I have a couple ideas on how I would achieve this. Not sure how I would script it.

方法1：（可能是更好的选择）

Method 1: (probably the better choice)

创建一个循环，直到回复收到然后执行命令ping请求的服务器
如果在时间x量仍没有收到回复/继续运行脚本。

Create a loop that pings a server until reply is received then execute command if no reply is received in X amount of time/runs continue script.

方法2：

检查，如果网络接口具有有效的IP，然后继续脚本

Check if network interface has valid IP then continue script

人会如何着手在脚本中添加此功能。将在awk或者grep的是使用在这样的情况呢？预先感谢您的任何输入。

How would one go about adding this functionality in a script. Would awk or grep be of use in a situation like this? Thank you in advance for ANY input.

推荐答案

这个命令应该等待，直到它可以与谷歌或已尝试50次：

This command should wait until it can contact google or it has tried 50 times:

for i in {1..50}; do ping -c1 www.google.com &> /dev/null && break; done

的为我在{1..50} 循环50次，或直至破被执行。在平-C1 www.google.com 1发送Ping报文谷歌和＆放大器;＆GT;的/ dev / null的重定向所有的输出为null，所以没有什么是所输出的。 ＆放大器;＆安培;突破执行只有previous命令成功完成破发，所以当平是成功的循环才会结束。

The for i in {1..50} loops 50 times or until a break is executed. The ping -c1 www.google.com sends 1 ping packet to google, and &> /dev/null redirects all the output to null, so nothing is outputed. && break executes break only if the previous command finished successfully, so the loop will end when ping is successful.

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