codemak1r@CodeMak1rMacBook ~ % brew cask install font-fira-code-nerd-font
Error: `brew cask` is no longer a `brew` command. Use `brew <command> --cask` instead.
codemak1r@CodeMak1rMacBook ~ % brew install font-fira-code-nerd-font --cask
原因是:brew 不再使用 brew cask这个命令
解决:brew < command > --cask代替即可
比如:brew install font-fira-code-nerd-font --cask