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树莓派

  • 起床闹钟

  • 控制led

    • 控制led闪烁
  • 如何使用面包板

前端学习

工具使用

  • HomeBrew
    • brew install mysql
    Error: SHA256 mismatch
    

Expected: 147854010874cd68289e3ca203399d5c149287167bca0b67f9c5677f0ee22eb8 Actual: 86f228a5f05e2c3a69308bdbfc77141019d3077c28f3ca99a99dbe0a3172f1ba Archive: /Library/Caches/Homebrew/cmake--patch-147854010874cd68289e3ca203399d5c149287167bca0b67f9c5677f0ee22eb8.git;a=commitdiff_plain;h=2ecf168f To retry an incomplete download, remove the file above.

解决方案:brew  doctor
          brew update 
        ```
        /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mach (LoadError)
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /usr/local/Library/Homebrew/extend/pathname.rb:2:in `<top (required)>'
        ```
 
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