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    2 df -h df -h 命令以人类可读的形式打印磁盘使用情况。 可以明显看到，这里的大小全都是GB、MB来展示了！ 3 df -a df -a命令，显示所有文件系统，包括伪文件系统、重复的文件系统和不可访问的文件系统。 普通的df命令没有包括这些数据。
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