释放Linux系统预留的硬盘空间大多数文件系统都会保留一部分空间作为紧急情况时用(比如硬盘空间满了)，这样能保证有些关键应用(比如数据库)在硬盘满的时候有点余地，不至于马上就crash，给监控系统和管理员一点时间去察觉。不过有些时候这部份预留的硬盘空间不用的话有点浪费，如何释放这部分系统预留的空间？查看当前硬盘空间情况# df -hFilesystem &am...

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