IV SEMESTER B.C.A EXAMINATIONS NOV/DEC 2008
NEW SCHEME
COMPUTER SCIENCE
4 BCA - 4 :Unix Operating System
TIME:3HOURS MAX.MARKS:80
Instructions : All sections are compulsary
SECTION-A
Answer any eight of the following questions: 8 X 3 = 24
1.Explain the unix file system layout.
2.Explain different file permissions and how they are assigned to owner ,group and others?
3.Explain with an example how bourne shell handles command line arguments.
4.Explain briefly the steps involved in CREAT system call.
5.Explain the use of the following commands with an example
a) Grep
b)Tail
6.What are the security levels in Unix Operating System ?
7, Write a note on file compression.
8.Write unix commands for the following
a)To print the total numbers of users currently logged in
b) To merge files Class 1.dat and Class2 .dat as Class 3.dat
9.Write a shell program to reverse the given string
10.Explain the differnce between Multitasking and Multiprogramming
SECTION-B
Answer any four of the following 4 X 14 = 56
11.a)How does unix access files ?
b)Explain with a neat Diagram of Unix System Kernal. 4 + 10
12.a)What is an interrupt ?Explain how interrupts are handled in unix ?
b)Explain the steps involved in EXIT and EXEC system calls . 7 + 7
13.a) Explain file management in Unix Operating System.
b)Explain differnt states of a process and its associated Unix System Calls. 7 + 7
14.a) what is a inode ? Explain how inodes are accessed with an examples ?
b) Write a shell program to find the factorial of a given number. 8 + 6
15.a)Write a notes on awk and sed.
b)Write a shell program to display only the sub directories in the current
directory using a for loop. 8 + 6
16.a)Explain different loop control structures available in bourne shell.
b) Explain briefly supervisor privileges and user privileges 8 + 6
NEW SCHEME
COMPUTER SCIENCE
4 BCA - 4 :Unix Operating System
TIME:3HOURS MAX.MARKS:80
Instructions : All sections are compulsary
SECTION-A
Answer any eight of the following questions: 8 X 3 = 24
1.Explain the unix file system layout.
2.Explain different file permissions and how they are assigned to owner ,group and others?
3.Explain with an example how bourne shell handles command line arguments.
4.Explain briefly the steps involved in CREAT system call.
5.Explain the use of the following commands with an example
a) Grep
b)Tail
6.What are the security levels in Unix Operating System ?
7, Write a note on file compression.
8.Write unix commands for the following
a)To print the total numbers of users currently logged in
b) To merge files Class 1.dat and Class2 .dat as Class 3.dat
9.Write a shell program to reverse the given string
10.Explain the differnce between Multitasking and Multiprogramming
SECTION-B
Answer any four of the following 4 X 14 = 56
11.a)How does unix access files ?
b)Explain with a neat Diagram of Unix System Kernal. 4 + 10
12.a)What is an interrupt ?Explain how interrupts are handled in unix ?
b)Explain the steps involved in EXIT and EXEC system calls . 7 + 7
13.a) Explain file management in Unix Operating System.
b)Explain differnt states of a process and its associated Unix System Calls. 7 + 7
14.a) what is a inode ? Explain how inodes are accessed with an examples ?
b) Write a shell program to find the factorial of a given number. 8 + 6
15.a)Write a notes on awk and sed.
b)Write a shell program to display only the sub directories in the current
directory using a for loop. 8 + 6
16.a)Explain different loop control structures available in bourne shell.
b) Explain briefly supervisor privileges and user privileges 8 + 6
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