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Jun 26th, 2019
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  1. setA:
  2. 2
  3. 4
  4. 5
  5. 6
  6.  
  7. set B:
  8. 1 123
  9. 2 abc
  10. 3 def
  11. 4 hij
  12.  
  13. 1 123
  14. 3 def
  15.  
  16. awk 'NR==FNR {key[$1]; next} !($1 in key)' setA setB
  17.  
  18. 1 123
  19. 3 def
  20.  
  21. join -v2 setA setB
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