Inheritance takes care of setting permissions for newly created files and
directories, but it does not affect permissions for existing files and directories. No
matter how carefully you plan ahead, you will eventually need to change
permissions on an existing directory structure and all of the files it contains.
There are two possible ways to make a large-scale permissions change:
1.Make the change to one file or directory and then propagate the change to
other files and directories by copying the whole ACL from the file or directory
that you already changed.
2.Incrementally ...
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