Q. The Unix Operating System Kernel maintains two key data structures related to processes, the process table and the user structure. Now, consider the following two statements:

I. The process table is resident all the time and contain information needed for all processes, even those that are not currently in memory.
II. The user structure is swapped or paged out when its associated process is not in memory, in order not to waste memory on information that is not needed.

Which of the following options is correct with reference to above statements ?

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Q. Consider the following operations to be performed in Unix:

“The pipe sorts all files in the current directory modified in the month of “June” by order of size and prints them to the terminal screen. The sort option skips ten fields then sorts the lines in numeric order.”

Which of the following Unix command will perform above set of operations?

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Q. Which of the following statement(s) is/are True regarding ‘nice’ command of UNIX?

I. It is used to set or change the priority of a process.
II. A process’s nice value can be set at the time of creation.
III. ‘nice’ takes a command line as an argument.

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Q. In UNIX, processes that have finished execution but have not yet had their status collected are known as ................

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Q. In UNIX operating system, when a process creates a new process using the fork() system call, which of the following state is shared between the parent process and child process?

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Q. Which of the following information about the UNIX file system is not correct?

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Q. Which of the following option with reference to UNIX operating system is not correct?

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Q. What is the function of following UNIX command?

WC – l < a >b&

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Q. Which of the following statement is not correct with reference to cron daemon in UNIX O.S?

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Q. 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?

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Q. In Unix, the login prompt can be changed by changing the contents of the file ...............

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Q. 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?

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Q. In Unix operating system, special files are used to :

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Q. 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)

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Q. In Unix, the command to enable execution permission for file “mylife” by all is ................

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Q. What will be the output of the following Unix command ?

$rm chap0\[1 - 3\]

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Q. Which of the following out commands will output "onetwothree"?

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Q. 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

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Q. Which of the following set of Unix commands will always display “WELCOME” ?

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Q. Which of the following shell scripts will produce the output “my first script” ?

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