08/04/03 14:46:54
>>162
man mount_union
The union filesystem manipulates the namespace, rather than individual
filesystems. The union operation applies recursively down the directory
tree now rooted at uniondir. Thus any filesystems which are mounted
under uniondir will take part in the union operation. This differs from
the union option to mount(8) which only applies the union operation to
the mount point itself, and then only for lookups.