R5311902 Unix Programming

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Code No: R5311902

IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009 UNIX PROGRAMMING (Electronics & Computer Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Write short notes on: - Unix system services - Shell responsibilities - Inode block.

[16]

2. Explain the following Unix shell commands with examples. cut, paste, egrep, fgrep.

[4×4]

3. Write shell scripts for following: - to calculate sum of digits in a 5 digit number. - To calculate area & perimeter of a square, area & circumference of a circle.

[16]

4. Explain following - Shell metacharecters - Shell types in Unix

[16]

5. (a) What are the different ways to position a standard I/O stream? (b) Write a program to copy standard input to standard output using getc and putc.

[8+8]

6. (a) State the differences between alarm, pause and sleep functions. (b) What is raise function? Write a program to implement a raise function.

[8+8]

7. Write a program to test different sorts of locks on different regions of a file and explain its working. [16] 8. (a) Explain in detail, the message queue structure in the kernel. (b) What are the different attributes of a message. Explain. ?????

[10+6]

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Code No: R5311902

IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009 UNIX PROGRAMMING (Electronics & Computer Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Unix is a multitasking System. Justify. (b) Differentiate tools and utilities in Unix. Explain them in detail.

[8+8]

2. (a) What will cat abc abc abc will display? (b) How do you copy all directories & files from current directory xyz to its parent abc? (c) Explain about awk command.

[4+4+8]

3. Write shell scripts for following: - to calculate sum of digits in a 5 digit number. - To calculate area & perimeter of a square, area & circumference of a circle.

[16]

4. (a) Define Unix shell. Explain shell environment. (b) Briefly explain Different shells available in Unix.

[8+8]

5. (a) Write a program to open a file and then unlink it. (b) Explain how a file or directory is renamed.

[8+8]

6. (a) What are the tasks performed by fork system call in process creation? (b) What are the different tasks performed by exec system call in invoking a new program. 7. Explain F GETLK, F SETLK and F SETLKW commands in detail.

[8+8] [16]

8. (a) Write a program to create a pipe and to execute it on the client. (b) Mention the rules for writing information into the pipe. ?????

[8+8]

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Code No: R5311902

IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009 UNIX PROGRAMMING (Electronics & Computer Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Write short notes on: - Unix system services - Shell responsibilities - Inode block.

[16]

2. Explain the following Unix shell commands with examples. cut, paste, egrep, fgrep. 3. Attempt following: - write a shell script to find factorial of any number entered from keyboard. - Write a shell script to find gcd of 2 integers entered from key board.

[4×4]

[16]

4. (a) Write a shell script to simulate cp command. (b) What is the use of set command? Explain with examples.

[8+8]

5. Write short notes of the following functions: (a) getcwd (b) umask (c) fstat (d) chmod.

[4×4]

6. (a) Explain parent - child processes in detail. (b) What is a signal function? Explain any two signals in detail.

[8+8]

7. (a) Write a short note on competing locks. (b) Explain the usage of read and write functions with locking.

[8+8]

8. (a) Most unix systems allow a process to attach the same shared memory region to more than one location in its address space. Is this a bug or a feature? When would this be useful? What problems could it cause? (b) Explain the effect of O-NDELAY flat in detail. [8+8] ?????

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Code No: R5311902

IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009 UNIX PROGRAMMING (Electronics & Computer Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What is the difference between the text editing provided by ‘ed’ & ‘vi’ text editors. (b) What are the two operational modes of vi editor? What is the use of each? [8+8] 2. Briefly explain the commands to be used for performing following: - converting one file to another - displaying the beginning of a file - splitting a file vertically - translating characters.

[16]

3. (a) Write a shell script to copy multiple files without overwriting the destination files. (b) Write a shell script to accept a string from terminal & use expr to echo a suitable message if the string does not have atleast 10 characters. [8+8] 4. Write short notes on the operators used with test for evaluating - numeric data - string data - file data

[16]

5. (a) Explain the various functions used for opening a standard I/O stream. (b) State the differences between getc, fgetc and getchar functions.

[10+6]

6. (a) Write a program to execute the command line arguments using system function. (b) Write a program to illustrate different exit statuses.

[8+8]

7. Write a program to test different sorts of locks on different regions of a file and explain its working. [16] 8. (a) Mention the rules for reading and writing data in a pipe. (b) State the advantages and disadvantages of pipes and FIFOs. ?????

[8+8]