Building virtual filesystems with cmdfs
Friendly Filter
Cmdfs builds a filtered virtual filesystem based on a source directory tree. You can even integrate other programs to convert data on the fly.
It’s a common task: You only want the users to see certain files on a file server, and the computer also needs to change these files dynamically during access. From the large collection of material on the server, perhaps you want the back office staff to see only the office documents and the graphical artists only the graphics.