How do I delete lines of a given interval in a file containing a matching word?

Question

I need to use sed to delete from a file only the lines containing a given word. But if my file has 50 lines, I only need to look at the first 30 lines for example.

I know that:

sed '1,30d' f.txt

will delete the first 30 lines of the file.

And:

sed '/Text/d' f.txt

will delete all the lines in the file containing the matching word "Text".

How do I combine these two to solve my problem? Thank you.

Answer 1

It seems that you want to delete the lines containing Text within the first 30 lines in your file.

You can say:

sed '1,30{/Text/d}' f.txt

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If you wanted to delete the first 30 lines and the lines containing Text anywhere in the file, you could say:

sed '1,30d;/Text/d' f.txt

Answer 2

您错过了“ -i”选项：

sed -i '1,30{/Text/d}' f.txt

Answer 3

sed "/Text/ d;30 q" f.txt

应该更快，尤其是在大文件中， 如果您在30后丢弃行。