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June 16, 2023 18:41
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Find missing records in A.txt, but not in reference set B.txt
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| awk 'NR==FNR{a[$0]=1;next}!a[$0]' B A | |
| # or better memory usage: | |
| awk 'NR==FNR{a[$0];next} !($0 in a)' B A | |
| grep -Fvx -f B.txt A.txt |
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