Summary
Unionfs is a filesystem service for Linux, FreeBSD and NetBSD which implements a union mount for other file systems, allowing files and directories of separate file systems to be transparently overlaid, forming a single coherent file system.
1
The mount_unionfs utility attaches directory above uniondir in such a way that the contents of both directory trees remain visible, with directory becoming the upper layer and uniondir becoming the lower layer by default.
2
According to
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mount_unionfs(8) - man.freebsd.org
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Summary
Unionfs is a filesystem service for Linux, FreeBSD and NetBSD 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 within the merged branches will be seen together in a single merged directory, within the new, virtual filesystem.
UnionFS - Wikipedia
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unionfs(5) - man.freebsd.org
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