Computer Science Illuminated
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 mechanism in UNIX environment:

  • In UNIX environment, the file protection is represented in the table format and consists of three rows and three columns as follows:
OperationOwnerGroupWorld
ReadYesYesYes
Write/DeleteYesYesNo

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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