M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Computer Science
Paper III UNIX PROGRAMMING
2 20933 AA
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
Each question carries 6 marks.
1. Explain briefly about Pipes.
2. List and explain in brief about the distinct steps to execute a command.
3. Explain about shift command and with an example script showing the shift
operation.
4. Explain about the process of making a shell script iterative with an example.
5. Write about UUCP.
6. Explain about unix name spaces in brief.
7. Write about Internet Superserver.
8. What do mean by Out-of-Band Data. Explain
SECTION — B
Answer FIVE questions. 10 40 Marks)
Each question carries 10 marks.
UNIT I
9. List and explain in briefly the 6 different states of a job.
Clearly explain properties and uses of
/dev/nufl
/dev/tty
Or
10. What is a job? Show how can you move a job from the background to foreground
and vice versa with examples.

UNIT II
11. Write a shell script to find the decimal equivalent to 1101001.
What is string expression?. Explain how Strings can be handled in Unix.
Or
12. Create a script that simulates the 1s command but prints only three columns of
our choice.
UNIT III
13. Explain about
Shared Memory
XNS.
Or
14. What is FIFO? Why FIFOs are called Named Pipes? Explain.
Write a short note on Message Queues.
UNIT IV
15. Explain about
Input/Output Multiplexing
Reserved Ports.
Or
16. List and Explain briefly the System Calls associated with UDP Communication.