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use for top N |group_sum == |sort|uniq -c|sort -nr performance sample data is 1583232 rows with 621 unique value (20x faster) time ./bin/group_sum < sample.log > /dev/null real 0m0.766s user 0m0.758s sys 0m0.008s time cat sample.log|sort|uniq -c|sort -nr > /dev/null real 0m15.865s user 0m16.714s sys 0m0.120s use for merge two files with same key as 1st column cat one.log|fill_pipe -f two.log use for unique |uniq
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