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Nov 16th, 2018
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  1. Line1
  2. Line2
  3. Line3
  4. -----
  5. Line1
  6. Line2
  7. LineEXTRA
  8. Line3
  9. -----
  10. Line1
  11. Line2
  12. Line3
  13.  
  14. Line1
  15. Line2
  16. Line3
  17. -----
  18. Line1
  19. Line2
  20. LineEXTRA
  21. LineNEW
  22. -----
  23. Line1
  24. Line2
  25. Line3
  26.  
  27. awk '/Line2/ {
  28. print; getline; if ($0 ~ /Line3/) sub(/3/,"NEW")
  29. }
  30. { print }' file
  31.  
  32. Line1
  33. Line2
  34. LineNEW
  35. -----
  36. Line1
  37. Line2
  38. LineEXTRA
  39. Line3
  40. -----
  41. Line1
  42. Line2
  43. LineNEW
  44.  
  45. awk '/Line2nLineEXTRA/ {
  46. print; getline; if ($0 ~ /Line3/) sub(/3/,"NEW")
  47. }
  48. { print }' file
  49.  
  50. awk '/Line2/ {
  51. print; getline; if ($0 == "LineEXTRA"){print;getline; sub(/3/,"NEW")}
  52. }
  53. { print }' file
  54.  
  55. sed -zr 's/(Line2nLineEXTRAnLine)3/1NEW/g' ex
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