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Thread: + symbol????

  1. #1
    Contributing Member
    Join Date
    Dec 2006
    Answers
    39

    + symbol????

    Can any one explain me abt the significance of the symbol "+" next to permissions in the below file

    #ls -ltr temp1
    -rw-r--r--+ 1 sharif staff 4081304 Jan 17 10:57 temp1

    its there only for few files.. if u see the below case its not there

    -rwxrwxr-x 1 sharif staff 30406012 Jun 30 2006 temp2

    Any specific reasons???

    Cheers,
    Sharif.S


  2. #2
    Contributing Member
    Join Date
    Jun 2006
    Answers
    95

    Re: + symbol????

    I am also interested to find this out.. any unix gurus out there ..


  3. #3
    Expert Member
    Join Date
    Sep 2006
    Answers
    130

    Re: + symbol????

    Hi Sharif,

    The + signifies that there is an ACL set for the file.
    ACLs or Access Control Lists which are used in Solaris and Linux, gives a user the ability to grant file permissions on a user-by-user basis.
    For example, you can create a file that is readable for some users & writable for some other users.
    Now, u may think that the same thing can be done rwx permissions, but ACLs provide a much higher degree of control over permissions than standard unix groups.
    They are completely under the control of the owner of the file and u don't need the system administrator to create and maintain groups for you.

    The two main commands you will use to manipulate ACLs are setfacl and getfacl.

    For example, if I have a file named testing.c, I can set the ACL to allow the owner alone to read & write the file,

    whereas the group & others has no access to the file, not even read permission,
    setfacl -s user::rw-,group::---,other:--- testing.c
    In the above setfacl commands, the owner gets read/write permissions (rw-) while the group and others get no permissions (---).

    The user can then grant read-only access to user devoracl with:
    setfacl -m user:devoracl:rw- testing.c
    Similarly, permissions can be set to some other user also.

    After setting the ACL on the file, note that ls shows a + after the normal permission list:
    ls -l testing.c
    -rw-rw----+ 1 robin staff 0 Jan 3 10:07 testing.c


    To display the ACL for the file, getfacl command is used,
    getfacl testing.c
    user::rw-
    user:devoracl:rw-
    group::rw-
    other:---


    Hopefully the explanation & examples have cleared ur queries.

    *** Innila ***

    Last edited by Innila; 02-20-2007 at 12:56 AM.

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