背景：macOs High Sierra 升级 macOs Mojave后，idea 报错，Terminal git也不行：
Сannot Run Git
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
处理：
1、 xcode-select --install
如提示：xcode-select: error: command line tools are already installed, use "Software Update" to install updates 证明安装成功
2、安装完成后，Terminal里的git可以正常运行了，IDEA里还是同样的报错，将Git配置栏里的/usr/bin/git改为git，搞定
