为了做到这一点，要使用路径名，有时就在当前目录。
To do that, you use pathnames and, sometimes, the current directory.
ENOTDIR：指定的路径名必须为目录，但却不是。
ENOTDIR — The specified path name needs to be a directory, but it isn't.
从shell提示，您可以显示您所在的目录的路径名，方法是运行命令pwd，如清单1所示。
From a shell prompt, you can display the path name of the directory you're in by running the command PWD, shown in Listing 1.
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