用变量替换文本 [英] Replace a text with a variable

问题描述

我该怎么做?

sed -i 's/wiki_host/$host_name/g' /root/bin/sync

它将用文本$host_name替换wiki_host. 但是我想用变量的内容替换它.

我尝试过

sed -i 's/wiki_host/${host_name}/g' /root/bin/sync

它也不起作用.

解决方案

您需要使用双引号:

$ sed -i "s/wiki_host/${host_name}/g" /root/bin/sync

您的单引号可防止将shell变量替换为其内容.

How can I do this?

sed -i 's/wiki_host/$host_name/g' /root/bin/sync

It will replace wiki_host with the text $host_name. But I want to replace it with the content of the variable..

I tried it with

sed -i 's/wiki_host/${host_name}/g' /root/bin/sync

It doesn't work either.

解决方案

You need to use double quotes:

$ sed -i "s/wiki_host/${host_name}/g" /root/bin/sync

Your single quotes prevent the shell variable from being replaced with its contents.

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