使用SED在文件中搜索并替换IP地址 [英] Using sed to search and replace an ip address in a file

问题描述

一直试图得到这个工作了一段时间，而不是真的很得到它。
基本上，我有改变或多或少每天的基础上的IP地址的文件。该文件只包含一个IP地址，这是一个我想用我的疯狂grepping替换找到我目前的内部IP。

我有这种

 ＃！/ bin / sh的newip = $（使用ifconfig | grep的0xFFF的| grep的-eo（[0-9] {1,3} \\）{3} [0-9] {1,3}'| grep的-v 255）回声$ newip
SED的/*\\.*\\.*\\.*/\"$ newip/ G'的log.txt＆GT; logmod.txt
 

但它不匹配和替换。
我不熟悉sed和我用正则表达式初学者了。

任何帮助将是真棒！
感谢：）

解决方案

如果你的版本 SED 支持扩展正前pressions（即 -r 选项），你可以做这样的事情（这类似于你在你的的grep 语句是什么）。还要注意 $ newip 是单引号外面让Shell来替换它。

 的sed -r的/（\\ B〔0-9] {1,3} \\。）{3} [0-9] {1,3} \\ B' / $ newip /
 

BTW这个解决方案仍然匹配不重present IP地址字符串。请参见在 IP不会忽略作为更复杂的解决方案。 p>

Been trying to get this working for a while and not really quite getting it. Basically, I have a file with an ip address that changes more or less on a daily basis. The file only contains one ip address and this is the one I'm trying to replace with my crazy grepping to find my current internal ip.

I have this

#!/bin/sh

newip=$(ifconfig | grep 0xfff | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' | grep -v 255)

echo $newip
sed 's/*\.*\.*\.*/"$newip"/g' log.txt > logmod.txt

but it's not matching and replacing. I'm not familiar with sed and I am a beginner with regexps too.

Any help would be awesome! Thanks :)

解决方案

If your version of sed supports extended regular expressions (the -r option), you could do something like this (which is similar to what you have in your grep statement). Also note $newip is outside the single quotes to allow the shell to replace it.

sed -r 's/(\b[0-9]{1,3}\.){3}[0-9]{1,3}\b'/$newip/

BTW this solution still matches strings that do not represent IP addresses. See this site under IP Adresses for more complex solutions.

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