COMPUTER SCIENCE ILLUMINATED
7th Edition
ISBN: 9781284208047
Author: Dale
Publisher: JONES+BART
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Chapter 11, Problem 38E
Explanation of Solution
File protection
- 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:
| Operation | Owner | Group | World |
| Read | Yes | Yes | Yes |
| Write/Delete | Yes | Yes | No |
| Execute | No | No | No |
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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Students have asked these similar questions
I need help creating the network diagram and then revising it for the modified activity times.
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
Given the following Extended-BNF grammar of the basic mathematical expressions:
Show the derivation steps for the expression: ( 2 + 3 ) * 6 – 20 / ( 3 + 1 )
Draw the parsing tree of this expression.
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Chapter 11 Solutions
COMPUTER SCIENCE ILLUMINATED
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