
Computer Science Illuminated
7th Edition
ISBN: 9781284155617
Author: Nell Dale, John Lewis
Publisher: Jones & Bartlett Learning
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Chapter 11, Problem 40E
a.
Program Plan Intro
File protection
- In UNIX environment, the file protection is represented in the table format and consists of three rows and three columns as follows:
Operation | Owner | Group | World |
Read | Yes | Yes | Yes |
Write/Delete | Yes | Yes | No |
Explanation:
From the above table,
- Each cell in the table represents the Boolean values.
- The Boolean value determines whether the file is to be read, write, or execute.
- The Boolean value “Yes” specifies that the permission is granted to access the file.
- The Boolean value “No” specifies that the permission is not granted to access the file.
Explanation of Solution
b.
Access to write/delete the file:
From the above table,
- It is known that the owner and list of users in a group are only allowed to write or delete the data from the file.
- The Boolean value “Yes” is present only on the “Owner”, and “Groupp&#...
Explanation of Solution
c.
Access to execute the file:
From the above table,
- It is known that only the “Owner” is allowed to execute the data from the file.
- The Boolean value “Yes” is present only on the “Owner” and ind...
Explanation of Solution
d.
Content of the file:
From the above table,
- It is known that only the “Owner” is allowed to execute the data from the file.
- So, the file must be an executable file.
- The Boolean value “Yes” is present only on the “Owner” to perform execution operation in the file...
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Chapter 11 Solutions
Computer Science Illuminated
Ch. 11 - Prob. 1ECh. 11 - Prob. 2ECh. 11 - Prob. 3ECh. 11 - Prob. 4ECh. 11 - Prob. 5ECh. 11 - Prob. 6ECh. 11 - Prob. 7ECh. 11 - Prob. 8ECh. 11 - Prob. 9ECh. 11 - Prob. 10E
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