Question

OK I found this question:

How do I delete a matching line, the line above and the one below it, using sed?

and just spent the last hour trying to write something that will match a string and delete the line containing the string and the line beneath it (or a variant – delete 2 lines beneath it).

I feel I’m now typing random strings. Please somebody help me.

Answer 1

If I’ve understood that correctly, to delete match line and one line after

/matchstr/{N;d;}

Match line and two lines after

/matchstr/{N;N;d;}

• N brings in the next line
• d – deletes the resulting single line