In Listing 4 you see a line in the virtual disk descriptor file that was created for your virtual machine.

清单4给出为虚拟机创建的虚拟磁盘描述文件中的一行代码。

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The key is the line that extracts the amount of free disk space for each file system.

其中关键的一行是提取每个文件系统中空闲磁盘空间的大小。

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The function then grabs every line in the current file (getline(1,'$')) and calls the built-in writefile() function to write them to disk.

函数随后获取当前文件（getline(1,'$')）中的每一行并调用内置的 writefile() 函数来将它们写入到磁盘中。

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