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Re:On Counting (2017) by repsilat on Thursday May 24, 2018 @09:01AM (#17143514)
It's possible with hash tables too...

Also, the Unix approach can do something like this by spitting out days at a time and sorting them, and then doing a

    sort -m "$month/*" | uniq -c
on the individual files.

`sort -m` takes basically no memory, and should chew through data fast enough.

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