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Posted By: sunil Member Level: Diamond Posted Date: 23 Jun 2008
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2008 III B.Tech II Semester Regular Examinations, Apr/May 2008 UNIX PROGRAMMING Question paper
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Code No: R05320503
Set No. 3
III B.Tech II Semester Regular Examinations, Apr/May 2008
UNIX PROGRAMMING
(Computer Science and Engineering)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. “Operating systems like UNIX provide services both for programs and users”. Jus-
tify this statement with suitable examples.
2. (a) How to remove duplicate lines from a ?le using sort?
(b) How to count the number of ordinary ?les in home directory tree?
(c) Select lines 5 to 10 of a ?le in two ways.
3. (a) Write a shell script for the following task.
[16]
[5+5+6]
The word ‘unix’ is present in only some of the ?les supplied as arguments to
the shell script. Your shell script should searched each of these ?les in turn
and stop at the ?rst ?le that it encounters containing the word ‘unix’. This
?lename should be displayed on the screen.
(b) Write a C program which receives ?le names as command line arguments and
display those ?lenames in ascending order according to their sizes.
[8+8]
4. (a) Write a shell script which gets executed the moment the user logs in. It should
display the message “good morning/good afternoon/good evening” depending
upon the time at which the user logs in.
(b) Explain about here documents with an example.
[8+8]
5. (a) Write and explain about hard and symbolic links.. give an example for each.
(b) Explain about ?le descriptors & i-node?
6. Write the syntax of following functions. Explain each argument.
(a) kill
(b) raise
(c) alarm
(d) exit.
7. (a) Write a C program to use a function lock test to test for a lock.
(b) Write about lockf function.
8. Explain the following concepts about pipes
(a) Pipes between two process
(b) Pipes among three process in a shell
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