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operating system


Posted Date: 17 Aug 2008      Total Responses: 2

Posted By: Sangeeta vijay       Member Level: Gold     Points: 1



how to specify protection scheme in UNIX?




Responses

Author: Ansar    17 Aug 2008Member Level: SilverRating:     Points: 5

Consider you have a system that supports 5000 users. Suppose that you want to allow 4990 of these users to be able to access one file.

You can specify protection scheme in two ways:

1. Create an access control list with the names of all 4990users.

2. Put these 4990 users in one group and set the group accessaccordingly. This scheme cannot always be implementedsince user groups are restricted by the system.



Author: Rajiv Sandilya    19 Aug 2008Member Level: BronzeRating:     Points: 5

There are two methods for achieving this:
1. Create an access control list with the names of all 4990
users.
2. Put these 4990 users in one group and set the group access
accordingly. This scheme cannot always be implemented
since user groups are restricted by the system.
b. The universal access to files applies to all users unless their name
appears in the access-control list with different access permission.
With this scheme you simply put the names of the remaining
ten users in the access control list but with no access
privileges allowed.



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