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- setA:
- 2
- 4
- 5
- 6
- set B:
- 1 123
- 2 abc
- 3 def
- 4 hij
- 1 123
- 3 def
- awk 'NR==FNR {key[$1]; next} !($1 in key)' setA setB
- 1 123
- 3 def
- join -v2 setA setB
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