In the traditional Unix file access control model Unix syste

In the traditional Unix file access control model. Unix systems provide a default setting for newly created files and directories, which the owner may later change. Recall that Unix users are organized in groups, and that every user is part of a group. Settings are defined based on the OWNER, the user\'s GROUP and everyone else (denoted as OTHERS). The default is typically one among the following options: full access for group and other (recall the notion of group and \"other in Unix), read/execute for group and other. read/execute for group and none for other, NO for both group and other. Briefly discuss advantages of each setting and provide examples of a type of organization/situation where each could be appropriate.

Solution

In traditional UNIX File access control Model Systems are managed in three distinct scopes or classes.

Owner Or User : Files and directories are owned by a user. The owner determines the file\'s user class.

                        Distinct permissions apply to the owner.

Group :    Files and directories are assigned a group, which define the file\'s group class. Distinct permissions

               apply to members of the file\'s group. The owner may be a member of the file\'s group.

Other :   Users who are not the owner, nor a member of the group, comprise a file\'s others class. Distinct

             permissions apply to others.

Access permission Layout :

d                       rwx        rwx         rwx  

is directory        User     Group        Others

r : read , w : write, x : execute

for example

drwxrwxrwx : means (d) directory have all access permission to all ( rwx : user, rwx : group, rwx : others)

-r-xrwx-wx    : means (-) regular file r-x : user have read and execute persmissions, rwx : group have read, write

                      execute permissions and -wx   : others have write and execute persmissions

-Full access for group and others : persmissions should be like

     ----rwxrwx

regular file fully access by group and others. group and others can read the contents, change the contents (write in file) and execute the file (or copy the file to directory or from directory ).

-read/execute for group and others

----r-xr-x  

   Regular file read (read the contents of file) and execute by group and others , user or owner don\'t have anything to do

-read/execute for group and none for others

    ----r-x---

Regular file read and execute by group only , others don\'t have any permission

-No for both group and others

   -rwx------

Group and others don\'t have any type of permissions (only read ,write, execute permission to owner or user)   

OR

d---------

User ,group, others don\'t have any type of permission to directory file