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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Illumos version, still distributed today: https://github.com/illumos/illumos-gate/blob/master/usr/src/cmd/cal/cal.c
Here's the proof. https://github.com/memnoth/unix-v6/blob/master/source/s1/bc.y I'm going to try to see if this still compiles
there's a newer (evil) version if you fancy, https://github.com/Xylemon/xlennart
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