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UnionFS-fuse is a filesystem service for Linux which implements a union mount for other file systems. It allows files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system. Contents of directories which have the same path ... [More] within the merged branches will be seen together in a single merged directory, within the new, virtual filesystem. It first tries to access the file on the top branch and if the file does not exist there, it continues on lower level branches. If the user tries to modify a file on a lower level read-only branch the file is copied to to a higher level read-write branch if the copy-on-write (cow) mode was enabled. [Less]

A stackable unification file system, which can appear to merge the contents of several directories (branches), while keeping their physical content separate.