change directory

基本解释

Create a temporary directory for the installation files, and change directory (cd) into it
为安装文件创建一个临时目录，并切换到（ cd ）那个目录
Change directory up one level, and create a bare Git repository by cloning the project that you just created for your Web content
更改到上一级目录，通过复制刚刚为 Web 内容创建的项目创建一个裸 Git 存储库
The -C option forces the receiving tar to change directory to stuff (in your remote home directory) before it begins any processing.
C 选项强迫接收方的 tar 在开始进行任何处理之前，将目录更改到 stuff（在远程 home 目录中）。