If you’ve been using unix or linux long enough, you’ve probably found yourself wishing for more powerful permissions management. For example, if your web development group has been cooperating with another group on a somewhat sensitive project, you’ve probably wished you could easily set it so that those two groups – and only those two groups – could read and write to certain files. Or, as in my case, wished that you could allow the web server user to read and write to files without having to mess with any group permissions. ACLs are the tool that lets you do that.

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