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Re:An interactive cheatsheet tool for the command-line by mikelward on Saturday September 21, 2019 @12:01PM (#21036112)
Appears to be implemented here.

https://github.com/denisidoro/navi/blob/master/cheats/networ...

I'd nitpick on the implementation, but the point is you can change it. :)

Re:An interactive cheatsheet tool for the command-line by mikelward on Saturday September 21, 2019 @12:04PM (#21036124)
On Linux, you can do something more robust that also supports IPv6 based on

    ip -o a sh up primary scope global