Quick Linux ACL

I wanted a directory and everything under it to always get the same owner, group and mode, regardless of who created the files. Access Control Lists to the rescue.

I had to apt-get install acl to get the setfacl command. I’m not exactly clear on why I repeat two regular ACLs with the “d:” prefix to make them default ACLs. Why not just use the default syntax exclusively?

Source: SuperUser