UnionFS

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

File system · unionfs.filesystems.org

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What UnionFS’s own pages say

What it says it doesbuilds a stackable unification file system, which can appear to merge the contents of several directories (branches), while keeping their physical content separate. unionfs.filesystems.org

Each value is a quote AirStack found on the product’s own pages, read 2026-11-04. A missing field means AirStack has not found it on its pages.