Linux 用变量替换文本

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时间:2020-08-06 22:49:27  来源:igfitidea点击:

Replace a text with a variable

linuxbashvariablessed

提问by Vince

How can I do this?

我怎样才能做到这一点?

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

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

它将替换wiki_host为文本$host_name。但我想用变量的内容替换它..

I tried it with

我试过了

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

It doesn't work either.

它也不起作用。

采纳答案by Andreas Fester

You need to use double quotes:

您需要使用双引号:

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

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

您的单引号可防止 shell 变量被其内容替换。