如何安装 xCode 命令行工具？如何安装 Xcode 9 beta 和 xCode 8？
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How do I install xCode command line tools? How to install Xcode 9 beta along with xCode 8?
提问by Evan Conrad
Are the tools available? I have an apple developer account and I have Xcode 9 beta downloaded which I got from https://developer.apple.com/download/.
工具是否可用？我有一个苹果开发者帐户，我从https://developer.apple.com/download/下载了 Xcode 9 beta 。
Are Xcode 9 developer tools out?
Xcode 9 开发者工具出来了吗？
回答by Dershowitz123
When you install Xcode, you'll install command line tools too. You can verify by typing $ gcc. If you get an error like:clang: error: no input files, you already havecommand line tools. But just for info, you can do $ xcode-select --installif you want the command line tools.
当您安装 Xcode 时，您还将安装命令行工具。您可以通过键入来验证$ gcc。如果您收到类似的错误：clang: error: no input files，则您已经拥有命令行工具。但仅供参考，$ xcode-select --install如果您需要命令行工具，您可以这样做。
Now to use both Xcode8and Xcode9 Betatogether, you need to do the following:
现在同时使用Xcode8和Xcode9 Beta在一起，你需要做到以下几点：
0) Close all open Xcode projects and quit Xcode
0) 关闭所有打开的 Xcode 项目并退出 Xcode
1) Rename your Xcode(8 which will be just Xcode.app in your /Applications directory) to something like Xcode8.
1) 将您的Xcode（8，在您的 /Applications 目录中只是 Xcode.app ）重命名为Xcode8.
2) Type in $ xattr -d com.apple.quarantine /Users/<your_user_name>/<the downloaded directory>/Xcode-beta.app. Here you need to drag your xcode-beta(xcode9) to your terminal once you just type $ xattr -d com.apple.quarantine. Now, move your Xcode-beta into your /Applications directory and rename it as Xcode.
2) 输入$ xattr -d com.apple.quarantine /Users/<your_user_name>/<the downloaded directory>/Xcode-beta.app. 在这里，您只需输入$ xattr -d com.apple.quarantine. 现在，将您的 Xcode-beta 移动到您的 /Applications 目录并将其重命名为Xcode.
3) Type in $ sudo xcode-select -s /Applications/Xcode(which is 9 now).app/Contents/Developer. If you want to switch back to 8, just type in the same command with Xcode8.appin the place of Xcode.app.
3) 输入$ sudo xcode-select -s /Applications/Xcode(which is 9 now).app/Contents/Developer. 如果你想切换回8，只是在同一个命令与键入Xcode8.app在的地方Xcode.app。
4) Verify you're using Xcode 9 by typing $ xcode-select -print-path. You can see that it'll point to Xcode.appwhich actually is Xcode-beta, i.e., Xcode 9.
Xcode-beta is xcode 9.
4) 输入$ xcode-select -print-path. 你可以看到它会指向Xcode.app哪个实际上是 Xcode-beta，即 Xcode
9。Xcode-beta 是 xcode 9。
