What if mounting point conflicts with local directory?

user180574 asked:

This might help me hunt down some system configuration bug.

Suppose I make a local directory (e.g., “/foo”) in one disk partition, and copy some files to it. But later on I forget about it, and configure the same directory as mounting point for another disk partition in /etc/fstab.

Now if I reboot the system, what will happen, will /foo still hold local files or point to the other disk partition?


My answer:


When you mount some device to /foo, then the files on the new device appear, and the ones on the original device are hidden.

If you unmount /foo, then the original files will reappear.

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