Grep一个文件，并在第二个文件上使用sed -i删除grep的内容 [英] Grep one file and remove contents of the grep with sed -i on a second file

问题描述

我试图用一个命令从一个文件grep ip地址，并从另一个文件中删除grep的内容.

I am trying to grep ip addresses from one file and remove the contents of the grep from a second file with a single command.

主文件具有

header x.x.x.x
header x.x.x.x
header2 y.y.y.y
header2 y.y.y.y
header3 z.z.z.z
header3 z.z.z.z

临时文件具有

x.x.x.x
x.x.x.x
y.y.y.y
y.y.y.y
z.z.z.z
z.z.z.z

尝试

grep "header" masterfile | sed 's/^.* //' | sed -i "" '/$/d' tempfile

在sed命令删除条目之后，也希望删除空行.

Would also like to remove the empty line after the sed command removes an entry.

推荐答案

如果我理解正确，则需要以下内容:

If I understand it correct, you need the following:

grep -v -F -f <(grep '\<header\>' masterfile | cut -d' ' -f2) tempfile

或

grep -v -F -f <(sed 's/^header *//' masterfile) tempfile

您的输入将产生:

y.y.y.y
y.y.y.y
z.z.z.z
z.z.z.z

为了将更改保存到tempfile，您可以将命令输出重定向到另一个文件并将其移动到所需文件:

In order to save the changes to tempfile, you could redirect the command output to another file and move it to the desired file:

grep -v -F -f <(sed 's/^header *//' masterfile) tempfile > tmp && mv tmp tempfile

---

您似乎是sh，它不支持流程替换".在这种情况下，您可以使用以下代码:

---

You seem to be sh which doesn't support Process Substitution. In that case, you can use the following:

grep '\<header\>' master | cut -d' ' -f2 | grep -v -F -f - tempfile

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