例如，清单5显示了如何将文件从当前目录复制到一个已有的目录。

For example, Listing 5 shows how to copy the files from the current directory to an existing directory.

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缺省情况下，du将显示当前或指定的目录下每个文件和目录的文件使用情况。

By default, du shows the file usage for every file and directory beneath the current, or specified, directory.

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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)。

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

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