MacOS missing xcrun问题

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升级MacOS后brew upgrade经常会出现如下错误：

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The bottle needs the Apple Command Line Tools to be installed.
 You can install them, if desired, with:
 xcode-select --install

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

是因为系统升级后没有安装相应版本的Apple Command Line Tools
解决办法就是像错误提示里说的一样：

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$ xcode-select --install