使用 Sed 用字符串变量替换字符串变量 [英] Replace string variable with string variable using Sed

问题描述

我有一个名为 ethernet 的文件，其中包含多行.我已将其中一行保存为名为 old_line 的变量.该变量的内容如下所示:

I have a file called ethernet containing multiple lines. I have saved one of these lines as a variable called old_line. The contents of this variable looks like this:

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="2r:11:89:89:9g:ah", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

我创建了一个名为 new_line 的第二个变量，它类似于 old_line，但对文本做了一些修改.

I have created a second variable called new_line that is similar to old_line but with some modifications in the text.

我想使用 sed 将 old_line 的内容替换为 new_line 的内容.到目前为止，我有以下内容，但它不起作用:

I want to substitute the contents of old_line with the contents of new_line using sed. So far I have the following, but it doesn't work:

sed -i "s/${old_line}/${new_line}/g" ethernet

推荐答案

您需要对 oldline 进行转义，使其不包含正则表达式特殊字符，幸运的是这可以通过 sed 完成.

You need to escape your oldline so that it contains no regex special characters, luckily this can be done with sed.

old_line=$(echo "${old_line}" | sed -e 's/[]$.*[^]/\&/g' )
sed -i -e "s/${old_line}/${new_line}/g" ethernet

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