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  • I think I'll go with your solution. But stupid question, shall I use awk... < myfile..., cat myfile | awk..., or...? I can't seem to get desired output using those. (and awk ... myfile doesn't insert lines as well) Commented May 5, 2015 at 17:01
  • It seems that n (not N) is empty when I test it using else and printing it. I don't know much about awk, should variable be initialized beforehand? Commented May 5, 2015 at 17:12
  • Ok, that should be enough spam for today: It seems my awk doesn't support curly braces in regex. I'll google some more. Thank you! Commented May 5, 2015 at 17:31
  • @Misiur, that'll be an old version of gawk where {} were not enabled unless in POSIX compatibility mode. Best is to use the POSIXLY_CORRECT=1 like in my update to make it work without affecting compatibility with other awk implementations. Commented May 5, 2015 at 20:01