Chapter 4. File System Permissions
There's a lot of misinformation and confusion surrounding the proper management of permissions in OS X. Discussions on the topic have been fairly heated since the migration to OS X from OS 9, which had very loose capabilities for delegating, assigning, and managing access to files and folders. OS X, in contrast, was a native multiuser OS and, as such, permission-based restrictions were, and still are, at its heart and soul.
From a security perspective, file system permissions are your data's first line of defense in a multiuser environment. A well-managed permission scheme ensures that your data is accessible and modifiable only by the proper people. The file system, after all, is the gateway to your data. ...
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