[xcode] How do you update Xcode on OSX to the latest version?

You can try mas-cli (Mac Apple Store cli). Github project here

It would be

$ brew install mas
$ mas list
$ mas search Xcode
$ mas install <id> 

$ mas upgrade <id>

upd:

Had issues installing Xcode 12.2 in Big Sur. Solved them by entering into the App Store from the devs link.

https://developer.apple.com/download/release/

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