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.
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
you can use awk. eg search for the word "two" and skip 2 lines after it
$ cat file
one
two
three
four
five
six
seven
eight
$ awk -vnum=2 '/two/{for(i=0;i<=num;i++)getline}1' file
one
five
six
seven
eight
