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  • You super cool, all 3 answers works as expected. It would be very great if you could explain any of the above command. Commented Oct 16, 2015 at 21:02
  • @ChitthaShetty Have comments added Commented Oct 16, 2015 at 21:50
  • Thanks for the comment. Something goes over my head, do you have any good reference for sed and awk to start with. Commented Oct 17, 2015 at 9:10
  • @ChitthaShetty From online resources grymoire.com/Unix/Sed.html and main book is «Advanced Bash-Scripting Guide» Commented Oct 17, 2015 at 9:18