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Operating System interview questions and answers for freshers

(#M40167108) OPERATING SYSTEM QUESTION Application Software question Keep an EYE

Which of the given options is NOT an application software?

A. DOS
B. Microsoft Word
C. VLC media player
D. MySQL

Asked In Operating System Jax (1 year ago)

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(#M40153633) OPERATING SYSTEM QUESTION scheduling Keep an EYE

a computer memory is composed of 16k words of 8 bits

Asked In Operating System kowsalya (7 years ago)

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(#M40153632) OPERATING SYSTEM QUESTION scheduling Keep an EYE

a computer memory is composed of 16k words of 8bits

Asked In Operating System kowsalya (7 years ago)

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(#M40152806) OPERATING SYSTEM QUESTION Keep an EYE

No. of pages are given and using LRU algorithm we have to find the number of page faults.
a) 2 b) 6 c) 5 d)7

Asked In Operating System Nakshatra Mukhopadhyay (7 years ago)

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(#M40029508) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a FIFO?

A. FIFO are otherwise called as 'named pipes'. FIFO (first-in-first-out) is a special file which is said to be data transient. Once data is read from named pipe, it cannot be read again. Also, data can be read only in the order written. It is used in interprocess communication where a process writes to one end of the pipe (producer) and the other reads from the other end (consumer).

Asked In Operating System MAN (9 years ago)

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(#M40029507) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are links and symbolic links in UNIX file system?

A. A link is a second name (not a file) for a file. Links can be used to assign more than one name to a file, but cannot be used to assign a directory more than one name or link filenames on different computers.
Symbolic link 'is' a file that only contains the name of another file.Operation on the symbolic link is directed to the file pointed by the it.Both the limitations of links are eliminated in symbolic links.
Commands for linking files are:
Link ln filename1 filename2
Symbolic link ln -s filename1 filename2

Asked In Operating System MAN (9 years ago)

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(#M40029506) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. How do you change File Access Permissions?

A. Every file has following attributes:
owner's user ID ( 16 bit integer )
owner's group ID ( 16 bit integer )
File access mode word
'r w x -r w x- r w x'
(user permission-group permission-others permission)
r-read, w-write, x-execute
To change the access mode, we use chmod(filename,mode).
Example 1:
To change mode of myfile to 'rw-rw-r--' (ie. read, write permission for user - read,write permission for group - only read permission for others) we give the args as:
chmod(myfile,0664) .
Each operation is represented by discrete values
'r' is 4
'w' is 2 'x' is 1
Therefore, for 'rw' the value is 6(4+2).
Example 2:
To change mode of myfile to 'rwxr--r--' we give the args as:
chmod(myfile,0744).

Asked In Operating System MAN (9 years ago)

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(#M40029505) OPERATING SYSTEM QUESTION operating system Keep an EYE

What are the Unix system calls for I/O?

Asked In Operating System MAN (9 years ago)

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(#M40029504) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Brief about the directory representation in UNIX.

A. A Unix directory is a file containing a correspondence between filenames and inodes. A directory is a special file that the kernel maintains. Only kernel modifies directories, but processes can read directories. The contents of a directory are a list of filename and inode number pairs. When new directories are created, kernel makes two entries named '.' (refers to the directory itself) and '..' (refers to parent directory).
System call for creating directory is mkdir (pathname, mode).

Asked In Operating System MAN (9 years ago)

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(#M40029503) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is 'inode'?

A. All UNIX files have its description stored in a structure called 'inode'. The inode contains info about the file-size, its location, time of last access, time of last modification, permission and so on. Directories are also represented as files and have an associated inode. In addition to descriptions about the file, the inode contains pointers to the data blocks of the file. If the file is large, inode has indirect pointer to a block of pointers to additional data blocks (this further aggregates for larger files). A block is typically 8k.
Inode consists of the following fields:
File owner identifier
File type
File access permissions
File access times
Number of links
File size
Location of the file data

Asked In Operating System MAN (9 years ago)

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