November 25, 2011

UNIX AND SHELL PROGRAMMING JNTU previous years question papers

UNIX AND SHELL PROGRAMMING JNTU previous years question papers

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

1. (a) Explain about multitasking and multi user operating systems.
(b) How can you say that unix operating system provides more security than other
operating systems. [8+8]

2. What would be the effect of the following commands:
(a) df
(b) finger
(c) grep “^rao” xyz
(d) paste - d ‘|’ a3 a1 > a13
(e) join - t ‘|’ - j11 file1 file2
(f) tr ‘[a-z]’ ‘[A - Z]’ < xyz
(g) head -2 file1
(h) tail +2 file1. [16]

3. (a) Display the list of last 30 files present in the current directory. Also store this
list in a file myfile(by using pipelines).
(b) Write shell script to calculate factorial value. [8+8]

4. What would be the effect of the following commands:
(a) grep “^
...$” file1
(b) grep “^
.\{0, 3\}$” file1
(c) grep -c “^$” file1
(d) grep“^[A - Z]” file1
(e) egrep “UNIX|Unix|unix” file1
(f) grep “UNIX$” file1
(g) grep “UNIX.  UNIX” file1
(h) grep “.*” file1 > file2. [2×8=16]

5. (a) Explain the commands in C shell program with examples.
(b) Define signal? What are the different types of signals.

6. (a) When is begin pattern true? When it is false? Explain with an example.
(b) What are the similarities and differences between the next statement and the
getline function. [8+8]

7. (a) Define a variable and distinguish between a variable and a value.
(b) Distinguish between user defined variable and predefined variable.
(c) Distinguish between a shell variable and an environment variable. [5+5+6]

8. (a) Why should we use multiple expressions in chmod? Explain with an example.
(b) Explain the absolute assignment of chmod.



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