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Frequently Asked UNIX interview questions and answers for freshers Page 2

(#M40158887) UNIX QUESTION Compiling Keep an EYE

How i am able to compile two .c file from the single command in gcc compiler ?

Asked In UNIX Hitesh Kumar Tiwari (8 years ago)

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(#M40153204) UNIX QUESTION UNIX Keep an EYE

Which programming language is use in UNIX?

Asked In UNIX Lakshmi Narasaiah (10 years ago)

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(#M40153205) UNIX QUESTION UNIX Keep an EYE

Which programming language is used in UNIX?

Asked In UNIX Lakshmi Narasaiah (10 years ago)

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(#M40029532) UNIX QUESTION unix Keep an EYE

Q. What is a Map?

A. A Map is an Array, which contains the addresses of the free space in the swap device that are allocatable resources, and the number of the resource units available there

Asked In UNIX MAN (12 years ago)

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(#M40029513) UNIX QUESTION unix Keep an EYE

Q. Brief about the initial process sequence while the system boots up.

A. While booting, special process called the 'swapper' or 'scheduler' is created with Process-ID 0. The swapper manages memory allocation for processes and influences
CPU allocation. The swapper inturn creates 3 children:
the process dispatcher,
vhand and
dbflush
with IDs 1,2 and 3 respectively.
This is done by executing the file /etc/init. Process dispatcher gives birth to the shell. Unix keeps track of all the processes in an internal data structure called the Process Table (listing command is ps -el).

Asked In UNIX MAN (12 years ago)

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(#M40029512) UNIX QUESTION unix Keep an EYE

Q. What is a shell?

A. A shell is an interactive user interface to an operating system services that allows an user to enter commands as character strings or through a graphical user interface. The shell converts them to system calls to the OS or forks off a process to execute the command. System call results and other information from the OS are presented to the user through an interactive interface. Commonly used shells are sh,csh,ks etc.

Asked In UNIX MAN (12 years ago)

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(#M40029511) UNIX QUESTION unix Keep an EYE

Q. How does the inode map to data block of a file?

A. Inode has 13 block addresses. The first 10 are direct block addresses of the first 10 data blocks in the file. The 11th address points to a one-level index block. The 12th address points to a two-level (double in-direction) index block. The 13th address points to a three-level(triple in-direction)index block. This provides a very large maximum file size with efficient access to large files, but also small files are accessed directly in one disk read.

Asked In UNIX MAN (12 years ago)

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(#M40029509) UNIX QUESTION unix Keep an EYE

Q. How do you create special files like named pipes and device files?

A. The system call mknod creates special files in the following sequence.
1. kernel assigns new inode,
2. sets the file type to indicate that the file is a pipe, directory or special file,
3. If it is a device file, it makes the other entries like major, minor device numbers.
For example:
If the device is a disk, major device number refers to the disk controller and minor device number is the disk.

Asked In UNIX MAN (12 years ago)

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(#M40029570) UNIX QUESTION unix Keep an EYE

Q. In what way the protection fault handler concludes?

A. After finishing the execution of the fault handler, it sets the modify and protection bits and clears the copy on write bit. It recalculates the process-priority and checks for signals.

Asked In UNIX MAN (12 years ago)

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(#M40029571) UNIX QUESTION unix Keep an EYE

Q. How the Kernel handles both the page stealer and the fault handler?

A. The page stealer and the fault handler thrash because of the shortage of the memory. If the sum of the working sets of all processes is greater that the physical memory then the fault handler will usually sleep because it cannot allocate pages for a process. This results in the reduction of the system throughput because Kernel spends too much time in overhead, rearranging the memory in the frantic pace.

Asked In UNIX MAN (12 years ago)

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