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cli-guidelines
A guide to help you write better command-line programs, taking traditional UNIX principles and updating them for the modern day.
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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.
You may be interested in `arg.rs`, which isn't a library, just some code snippets I use to write command line parsers. Here's an example: https://github.com/alexwennerberg/crabmail/blob/main/src/arg.rs
That said, if your boss is dead-set on it, be sure you read and obey the Command Line Interface Guidelines. (Which, by the way, also say to use an existing parser library where possible rather than writing your own.)