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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.
When they should also get some hands-on experience, this could be helpful https://github.com/phyver/GameShell An interactive gamefied shell course
there is a "cli murder mystery" game (https://github.com/veltman/clmystery, but perhaps also other ones) teaching the basics of cat, ls, grep etc.
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