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  • This will improve things proportionally to how close is linenum2 to the beginning of the file. Thanks! Commented Mar 3, 2013 at 17:05
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    This improves nothing: “d Delete pattern space. Start next cycle.” – man sed. That means, the q will never be executed. Which is good, because otherwise the entire remaining part would be removed. Commented Mar 3, 2013 at 17:23
  • @manatwork you are right. Tried it out with no improvement in performance. Commented Mar 3, 2013 at 17:32
  • yes, of course. silly me. Commented Mar 3, 2013 at 19:09
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    Note that you can delete your own answer if you realise it's a mistake. Nothing wrong with that, quite the contrary. Commented Mar 3, 2013 at 20:29