sed 对变量而不是标准输入或文件进行操作 [英] Have sed operate on variable instead of standard input or a file

问题描述

有很多问题询问如何在sed模式中使用变量，例如:sed "s/re/$VAR/" file，但我想执行替换on 一个变量.到目前为止，我一直在使用 echo 来做到这一点:

There are many questions asking about how to use a variable within a sed pattern, for example: sed "s/re/$VAR/" file, but I want to perform a substitution on a variable. So far, I have been using echo to do this:

echo "$VAR" | sed 's/re/new/'

但是，虽然这有效，但看起来很混乱.在 bash 或 zsh 中是否有更简单/更优雅的方法?

But, though this works, it seems messy. Is there a simpler/more elegant way of doing this in bash or zsh?

推荐答案

你可以这样做:

sed 's/re/new' <<< "$var"

如果你想这样做并更新变量，你可以这样做:

If you want to do that and update the variable you can do this:

var=$(sed 's/re/new' <<< "$var")

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