My fish is blind? (fish does not recognise any commands after setting it as default shell on Mac OS Big Sur, M1 Mac)

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Here are the steps I used to setup the fish shell on my M1 MacBook Air. Per the comments on the question, the key to solving the Unknown Command issue is the fish_add_path:

$ brew install fish ​
$ fish
$ fish_add_path /opt/homebrew/bin
$ echo "/opt/homebrew/bin/fish" | sudo tee -a /etc/shells
$ chsh -s /opt/homebrew/bin/fish

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