How to use sed to remove the last n lines of a file

Question

I want to remove some n lines from the end of a file. Can this be done using sed?

For example, to remove lines from 2 to 4, I can use

$ sed          


        

Answer 1

This will remove the last 12 lines

sed -n -e :a -e '1,10!{P;N;D;};N;ba'