Mac系统使用Homebrew升级Git版本

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原先版本 1.7.10.2

升级后版本 2.10.0

① 打开终端，输入brew install git：

DavidtekiMacBook-Air:~ du$ brew install git

② git安装完成后，输入git --version，发现仍旧是1.7.10.2

DavidtekiMacBook-Air:~ du$ git --versiongit version 1.7.10.2 (Apple Git-33)

③ 输入which git，发现git位于/usr/bin/git目录下

DavidtekiMacBook-Air:~ du$ which git/usr/bin/git

④ 使用brew doctor，重点看第二个warning。

原因是：brew install git后的git安装包在 /usr/local/git 目录下，而系统默认/usr/bin 在/usr/local/bin之前。

所以解决方法就是将/usr/local/bin放在/usr/bin之前。

DavidtekiMacBook-Air:~ du$ brew doctorPlease note that these warnings are just used to help the Homebrew maintainerswith debugging if you file an issue. If everything you use Homebrew for isworking fine: please don't worry and just ignore them. Thanks!Warning: You have unlinked kegs in your CellarLeaving kegs unlinked can lead to build-trouble and cause brews that depend onthose kegs to fail to run properly once built. Run `brew link` on these:  gitWarning: /usr/bin occurs before /usr/local/binThis means that system-provided programs will be used instead of thoseprovided by Homebrew. The following tools exist at both paths:  git  git-cvsserver  git-shell  git-upload-packConsider setting your PATH so that /usr/local/binoccurs before /usr/bin. Here is a one-liner:  echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bash_profileWarning: Your Xcode (4.5.2) is outdated.Please update to Xcode 8.2.1 (or delete it).Xcode can be updated from the App Store.

⑤ 使用 pico .bash_profile命令，打开配置文件，输入export PATH="/usr/local/bin:$PATH"，

然后CONTRL+X退出，Y保存，回车

DavidtekiMacBook-Air:~ du$ pico .bash_profile

export PATH="/usr/local/bin:$PATH"

⑥ 退出终端，重新打开，并输入git --version，版本号变为2.10.0

DavidtekiMacBook-Air:~ du$ git --versiongit version 2.10.0

PS:以后如果要直接更新git，在终端直接输入brew upgrade git即可（brew upgrade为升级所有的包）

DavidtekiMacBook-Air:~ du$ brew upgrade git

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