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Jan 16th, 2018
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  1. sed -n '15,25p' inputfile
  2.  
  3. awk 'NR % 50 == 15 || NR % 50 == 25'
  4.  
  5. sed '15~50b;25~50b;d'
  6.  
  7. sed -n 'n;n;n;n;n;n;n;n;n;n;n;n;n;n;p;n;n;n;n;n;n;n;n;n;n;p;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n;n'
  8.  
  9. awk '(NR%50==15) || (NR%50==25)' inputfile
  10.  
  11. $ seq 135 | perl -ne 'print if $.%50==15 || $.%50==25'
  12. 15
  13. 25
  14. 65
  15. 75
  16. 115
  17. 125
  18.  
  19. $ seq 135 | perl -ne 'print if grep {$_==$.%50} (15,25)'
  20. 15
  21. 25
  22. 65
  23. 75
  24. 115
  25. 125
  26.  
  27. $ seq 135 | perl -ne 'print if grep {$_==$.%50} (15,25,32)'
  28. 15
  29. 25
  30. 32
  31. 65
  32. 75
  33. 82
  34. 115
  35. 125
  36. 132
  37.  
  38. awk 'BEGIN { a[15]; a[25] } NR % 50 in a'
  39.  
  40. $ time awk 'BEGIN { a[15]; a[25] } NR % 50 in a' <(seq 1000000) > /dev/null
  41.  
  42. $ time awk 'NR % 50 == 15 || NR % 50 == 25' <(seq 1000000) > /dev/null
  43.  
  44. $ time perl -ne 'print if $.%50==15 || $.%50==25' <(seq 1000000) > /dev/null
  45.  
  46. $ time perl -ne 'print if grep {$_==$.%50} (15,25)' <(seq 1000000) > /dev/null
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