| 31. | Which of the following statement is not correct with reference to cron daemon in UNIX O.S? |
| a. | The cron daemon is the standard tool for running commands on a pre-determined schedule. |
| b. | It starts when the system boots and runs as long as the system is up. |
| c. | Cron reads configuration files that contain list of command lines and the times at which they invoked. |
| d. | Crontab for individual users are not stored. |
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Answer: (d).Crontab for individual users are not stored.
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| 32. | In Unix, files can be protected by assigning each one a 9-bit mode called rights bits. Now, consider the following two statements: I. A mode of 641 (octal) means that the owner can read and write the file, other members of the owner’s group can read it, and users can execute only. II. A mode of 100 (octal) allows the owner to execute the file, but prohibits all other access. Which of the following options is correct with reference to above statements? |
| a. | Only I is correct |
| b. | Only II is correct |
| c. | Both I and II are correct |
| d. | Both I and II are incorrect |
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Answer: (c).Both I and II are correct
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| 33. | In Unix, the login prompt can be changed by changing the contents of the file ............... |
| a. | contrab |
| b. | init |
| c. | gettydefs |
| d. | inittab |
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Answer: (c).gettydefs
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| 34. | A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each? |
| a. | 32 GB |
| b. | 64 GB |
| c. | 16 GB |
| d. | 1 GB |
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Answer: (c).16 GB
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| 35. | In Unix operating system, special files are used to : |
| a. | buffer data received in its input from where a process reads |
| b. | provide a mechanism to map physical device to file names |
| c. | store list of file names plus pointers associated with i-nodes |
| d. | store information entered by a user application program or utility program |
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Answer: (b).provide a mechanism to map physical device to file names
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| 36. | Match the following in Unix file system : List - I List - II (a) Boot block (i) Information about file system (b) Super block (ii) Information about file (c) Inode table (iii) Storage space (d) Data block (iv) Code for making OS ready Codes : (a) (b) (c) (d) |
| a. | (iv) (i) (ii) (iii) |
| b. | (i) (iii) (ii) (iv) |
| c. | (iii) (i) (ii) (iv) |
| d. | (iv) (ii) (i) (iii) |
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Answer: (a).(iv) (i) (ii) (iii)
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| 37. | In Unix, the command to enable execution permission for file “mylife” by all is ................ |
| a. | Chmod ugo+X myfile |
| b. | Chmod a+X myfile |
| c. | Chmod +X myfile |
| d. | All of the above |
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Answer: (d).All of the above
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| 38. | What will be the output of the following Unix command ? $rm chap0\[1 - 3\] |
| a. | Remove file chap0[1 - 3] |
| b. | Remove file chap01, chap02, chap03 |
| c. | Remove file chap\[1 - 3\] |
| d. | None of the above |
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Answer: (a).Remove file chap0[1 - 3]
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| 39. | Which of the following out commands will output "onetwothree"? |
| a. | for val; do echo-n $val; done < one two three |
| b. | for one two three; do echo-n-; done |
| c. | for n in one two three; do echo-n $n; done |
| d. | for n in one two three {echo-n $n} |
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Answer: (c).for n in one two three; do echo-n $n; done
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| 40. | Assume that an implementation of Unix operating system uses i-nodes to keep track of data blocks allocated to a file. It supports 12 direct block addresses, one indirect block address and one double indirect block address. The file system has 256 bytes block size and 2 bytes for disk block address. The maximum possible size of a file in this system is |
| a. | 16 MB |
| b. | 16 KB |
| c. | 70 KB |
| d. | None of the above |
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Answer: (d).None of the above
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