如何搜索后通过变量替换词吗？ [英] How to replace a word through a variable after searching?

问题描述

我有这样一个问题。在一个文本文件（称为sampleText.txt）具有的Web URL这样，

I have a problem like this. In a text file(which is called sampleText.txt) has the web url like this,

webURL = "localhost.com"; 

我想用一个bash脚本更改此值。但是我
试着用这个我的脚本，BT也没有工作，
这里是我的脚本，

I want to change this value using a bash script. But I tried with this my script, bt it did not worked, here is my script,

#!/bin/bash 

URL=$(awk -F\" '/^webURL/{print $2}' sampleText.txt)

echo $URL 


if [ "$URL" != "www.google.com" ]; then

shopt -s globstar for file in sampleText.txt 

do

   sed -i.bak 's/$URL/www.google.com/g' $file 

done 

fi 

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我希望你能帮助我。任何帮助将大大AP preciated，Thankx ...：）

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I hope you will help me. Any help would be greatly appreciated, Thankx... :)

推荐答案

如果我理解你的意图，你想改变它与 WEBURL = 开头的行每一个网址www.google.com？如果是这样，您只需

If I understand your intent, you want to change every URL in lines which begin with webURL = to "www.google.com"? If so, you simply

$ sed -i.bak -r '/^webURL/{s/"[^"]+"/"www.google.com"/}' sampleText.txt

如果您有单，双引号的混合物，可以使用

If you have a mixture of single and double quotes, you can use

$ sed -i.bak -r "/^webURL/{s/['\"][^'\"]+[\"']/\"www.google.com\"/}"

这将正常化双引号。

which will normalise to double quotes.

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