linux - 如何通过搜索某个关键字将整行替换为空白行

Question

我有一个像目录一样存储数据的文件。我想在此文件中搜索关键字并将包含它的行替换为空行。
关键字将保存在 $2 中。

这是我到目前为止得到的:

sed '/$2/ c' " "' file.txt

感谢您的帮助。

Answer 1

使用 GNU sed 测试:

$ a="blank"   # One can use "$2" instead of "$a" below. It would work the same.
$ sed -i "s/.*$a.*//g" test.txt  # -i option overwrites test.txt with the replacement

示例 test.txt

$ cat test.txt
This is a test line
Replace this line with a blank line
This is another line

输出:

This is a test line

This is another line