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Re:Beating C with 70 lines of Go by crematoria on Wednesday November 20, 2019 @11:26PM (#21591461)
Source? People write CLI tools in Ruby and Node.js these days, so I really doubt that anybody would use the term "systems language" to refer to languages well-suited to building CLI tools.
Re:Beating C with 70 lines of Go by IshKebab on Thursday November 21, 2019 @03:40AM (#21592393)
https://www.wired.com/2009/11/google-announces-a-new-program...

> As a systems language, Go is intended to be used for developer applications like, for example, web servers.

Couldn't find a citation for CLI tools, but that should satisfy you (since people write web servers in Ruby and Node.js too).