昨晚升级了 mac 系统到10.13.1 High Sierra，重启后进入命令行，输入git命令，会出现
xcrun: error: invalid active developer path
(/Library/Developer/CommandLineTools), missing xcrun at:
/Library/Developer/CommandLineTools/usr/bin/xcrun
一脸懵逼，谷歌之后发现好像每次系统升级都可能会出现这个问题，在这里记录一下
解决方法
xcode-select --install
参考链接 http://www.ttlsa.com/linux/mac-git-xcrun-error-invalid-active-developer-path/ https://stackoverflow.com/questions/32893412/command-line-tools-not-working-os-x-el-capitan-macos-sierra-macos-high-sierra/32894314#32894314 https://apple.stackexchange.com/questions/254380/macos-sierra-invalid-active-developer-path
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