Computer Science Illuminated
Computer Science Illuminated
6th Edition
ISBN: 9781284055917
Author: Nell Dale, John Lewis
Publisher: Jones & Bartlett Learning
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Chapter 11, Problem 38E

Explanation of Solution

File protection mechanism:

  • It is a primary operation need to protect the file from multiple users who access the system, because there might be illegal users who can also access the file.
  • The protection mechanism of the file differs based upon the type of operating system.
    • The file protection mechanism in operating system is used to check whether the valid user is accessing the particular file.
    • File protection mechanism is also used to identify the user who uses the file for which purpose.
  • For example, 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
ExecuteNoNoNo

Explanation:

From the above table,

  • Each cell in the table represents the Boolean values.
  • The file protection settings are divided into three types:
    • Owner
    • Group
    • World
  • Owner:
    • The owner is the person who creates the file and has full rights on the file...

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