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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.
I've already been consulting online reference resources such as the GNU BASH reference manual and the pure sh bible (don't worry, regarding the former, I'm aware of the differences between BASH and POSIX shell).
NOTE:
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Hence, a higher number means a more popular project.