解决 Mac 升级为 Big Sur 系统后 Homebrew 命令失效的问题

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  1. 报错内容

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    Traceback (most recent call last):
    	10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `<main>'
    	 9: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `require_relative'
    	 8: from /usr/local/Homebrew/Library/Homebrew/global.rb:28:in `<top (required)>'
    	 7: from /usr/local/Homebrew/Library/Homebrew/global.rb:28:in `require'
    	 6: from /usr/local/Homebrew/Library/Homebrew/os.rb:3:in `<top (required)>'
    	 5: from /usr/local/Homebrew/Library/Homebrew/os.rb:21:in `<module:OS>'
    	 4: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:58:in `prerelease?'
    	 3: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `version'
    	 2: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `new'
    	 1: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:26:in `initialize'
    /usr/local/Homebrew/Library/Homebrew/version.rb:368:in `initialize': Version value must be a string; got a NilClass () (TypeError)

  2. 报错原因及解决办法

旧版本 Homebrew 不适配 Mac 的 Big Sur 系统，也因此失效，升级到最新的 Homebrew （brew update-reset）后解决这个问题。