[$] Rich access control lists
Access control lists (ACLs) can implement finer-grained access permissions
for files than the traditional Unix mode bits. Linux has ACL support, but
the POSIX ACLs supported by
Linux now have been showing their age for a while. POSIX ACLs may soon be
superseded by a more capable mechanism known as RichACLs. Click below (subscribers only) for
a look at RichACLs and what they bring to Linux.