In this lesson, I will introduce your first three commands: PWD (print working directory), CD (change directory), and ls (list files and directories).

在这一节，我会首先向你介绍三个命令：pwd(打印当前工作目录)，cd(改变目录)，还有ls(显示出文件和目录)。

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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。

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Change to the testing directory (CD testing), then type.

更改到测试目录(cd testing)，然后键入。

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