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>>>>> "Komal" == agencies ad1 <komal> writes:

    Komal> What is ACL (access control list) and how does it relate to
    Komal> XFS? In Linux we have permission per user ,group,and other
    Komal> how it is different from it?  Thanking you Komal

Access Control Lists refers to a method of giving fine-grained access
to files and directories.  The user, group and other method of access
control that the standard Linux filesystems use is too coarse in many
circumstances.  So when you have, for instance, a file in which you
want to grant read access to some users, write to other users and
similarly read and write to specific groups, you can use a filesystem
with ACLS.

Using ACLs you can define the following (from my experience with XFS):

- - Read, write and execute permissions for user and group of file and
others.  This is the standard Unix file permission paradigm.

- - User and group masks that will be automatically applied to new
permissions.  The masks consist of r,w and x bits.  If a bit is
off in the mask, the corresponding permission will not be enabled on
fresh ACLs even if the ACL explicitly requests it.

- - A list of users and groups.  r, w and x permissions can be granted
to each user and group in the list on an individual basis.

- - Directories also have a ``default'' ACL, which consists of the three
items above and which is automatically applied to all new files
created under that directory.  This is sort of equivalent to the
``Inherit permissions'' feature on Winduhs.  As far as I can make out
the (now defunct) POSIX 1003.1e standard for ACLs does not support the
concept of default ACLs.

Regards,

- -- Raju
- -- 
Raj Mathur                [EMAIL PROTECTED]      http://kandalaya.org/
       GPG: 78D4 FC67 367F 40E2 0DD5  0FEF C968 D0EF CC68 D17F
                      It is the mind that moves
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