在linux中查找字符串并替换行

问题描述

我想做以下事情，但我似乎无法找到一个优雅的方式来做到这一点。

我有一个文本文件，看起来像这个：

$ p $ ..更多值
stuff = 23
volume = -15
自动启动= 12
more values ..


现在音量值可能会改变，具体取决于情况。我需要一个脚本，可以找到volume = xxx的文本行，然后用volume = 0行替换它。什么是这个优雅的解决方案？本文中的这一行不保证是第一行，所以我需要一种方法来首先找到它。

解决方案

  sed's / ^ volume =。* / volume = 0 / g'file.txt 
  

I'd like to do the following, but I can't seem to find an elegant way to do it.

I have a text file that looks like this:

..more values
stuff = 23
volume = -15
autostart = 12
more values..

Now the "volume" value may change, depending on the circumstance. I need a script that can find that line of text with "volume = xxx" then replace it with the line "volume = 0". What is an elegant solution to this? This line in the text is not guaranteed to be the first line, so I need a way to find it first.

解决方案

sed 's/^volume =.*/volume = 0/g' file.txt

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