polydir is the absolute pathname of the directory to polyinstantiate.
polydir是要多实例化的目录的绝对路径名。
This directory has a parent and “grandparent” directory, as we’ll see later. And pwd shows the directory’s absolute pathname
我们在后面将会看到，这个目录有父和“祖父”目录。
An absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed.
绝对路径名从根目录开始，通过一个又一个的分支，一直到你要去的目录或者文件为止。
This converts the relative pathname to an absolute pathname, using PWD to calculate the full path. For the example shown here, if the filename is just the base name of the file, you can use.
这可以将一个相对路径转化成绝对路径，使用pwd来计算全路径。
One of the important aspects of tar to be aware of is that the pathname that you supply is treated as absolute.
tar的一个重要特点是，用户指定的路径名被看作绝对路径。
One of the important aspects of tar to be aware of is that the pathname that you supply is treated as absolute.
tar的一个重要特点是，用户指定的路径名被看作绝对路径。
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