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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.
For learning command line linux stuff, there are many guides and command line tutorials on github (you can use a google search phrase like "github linux terminal operating system tutorial" or something similar. This seems like a good guide, but again, your experience, background, etc. may mean you need something more basic).
NOTE:
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