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FreeBSD Access Control Lists
Access Control Lists (ACLs) solve these problems. They allow more flexibility than the standard Unix user/group/other set of permissions. ACLs have been available in commercial UNIXes such as IRIX and Solaris (and in Windows NT) for years. Now, thanks to the TrustedBSD project's work, ACLs are available in FreeBSD 5.0-RELEASE and beyond. Much of the information below applies, at least in part, to ACL implementations on other platforms; however, you will want to look at specific documentation to avoid being tripped up by differences in syntax. There shouldn't be many, as FreeBSD attempts to conform to the latest POSIX.1e draft.