File/Folder ACLs and MASK Setting - usage

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I'm struggling to understand the use of the mask when setting file/folder ACLs. For example:

  • I set the owning group to have r-x
  • I add a user as a named user to a ACL with rwx

Now a mask gets applied of r-x so the user that I wanted to have full control only has r-x. I understand why this is happening but I don't understand the purpose? I'm the admin and I am explicitly granting the user rwx so why does the system setup and apply the mask?

Darragh O'Shaughnessy's picture

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