DOS Interview Questions and Answers

Tell about networking related DOS commands?

ARP command is used to display and modify the Address Resolution Protocol(ARP) cache, which is a simple mapping of IP addresses to MAC addresses.
ARP is also useful when diagnosing duplicate IP assignment problems.
examples
arp -a

FINGER command allows you to view information about users logged onto a remote computer, that may include their email address, full name, when last time user logged in and read their e-mail etc.
examples
finger -l user@localhost

HOSTNAME command displays the name of the current host.
examples
hostname

IPCONFIG command allow you to configure network interfaces and view information about them.This command can be used to verify a network connection as well as to verify your network settings.
examples
ipconfig
ipconfig /all

PATHPING command utility enables a user to find network latency and network loss. Also that provides useful information about network latency and network loss at intermediate hops between a source address and a destination address.
examples
pathping www.microsoft.com

PING command is one of the most commonly used and known command. It allows the user to ping another IP address or computer/host name. It can help to determine whether the network is able to communicate with the network or not.
examples
ping www.google.com
ping -a 74.125.24.104

NBTSTAT command displays protocol statistics and current TCP/IP connections.
examples
nbtstat -a www.webiwip.com

NET command is used to manage, set, view and determine network settings.
examples
net view
net config

NETSTAT command is used to display the TCP/IP network protocol statistics and information.
examples
netstat
netstat -a

NSLOOKUP command enables a user to look up an IP address of a domain or host on the network.
examples
nslookup www.facebook.com

ROUTE command enables to view and modify the IP route table of the computer.
examples
route print

TRACERT / TRACEROUTE command helps determine network related issues or slowdowns. It is similar to ping command but can provides details of how a network packet travels and whether it may fail or slow down. It can help to determine the computer, router, switch or other network device which probably causes your network issues.
examples
tracert -d www.google.com

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What is DOS?

DOS is an abbreviation for Disk Operating System and refers to the PC operating system. This operating system works as a medium between user and computer system, and between hardware and software too.

It is a character based, single user, single tasking, standalone operating system.

It can perform following task-
1) Management of Hardware and control devices such as keyboard, mouse, monitor, printer and scanner.
2) File system management for managing files and directories.
3) Memory management (storage device) and allocation of memory to various programs.
4) Management of the programs (kernel, UI and API) and their execution.

Many DOS options and / or enhancements are available, including MS-DOS (Microsoft Disk Operating System), FreeDOS and DR-DOS.

What is the DOS commands and explain the internal and external commands?

DOS commands are small programs and instructions that are made to perform a particular task. Every DOS command works differently. It is difficult to work on the computer without these commands. In DOS, there are many types of commands and they are classified into two types -

(1) Internal Commands
(2) External Commands

Internal Commands : These commands enter into computer memory during computer booting and are part of shell. There is no external file in the computer to read internal command.These commands are not in the form of any files, therefore neither they can be viewed nor can be edited or detected.
For example most commonly used internal commands : DIR, MD, CD, TIME, DATE, COPY, COPY CON, TYPE etc.

External Commands : These are commands that are not in-built in DOS and are not part of shell, they are only loaded in memory when they are invoked. These commands are present in the form of files and mostly are in exe, bat and com extensions ,therefore they can be viewed, copied, changed or deleted.
For example most commonly used external commands : XCOPY, FORMAT, COPY, PRINT, SYS, EDIT, TREE, SORT, PROMPT etc.

Describe the 10 DOS commands?

The 10 DOS command are-

1) CD/CHDIR (Change Directory) command is used to displays or change directories in DOS. CHDIR is the alternative name of CD command.
examples
cd
cd ..
cd c:windows

2) CLS (CLRSCR) command is used to clear the contents of the terminal screen or console.
examples
cls

3) COPY command is used to copy complete file from one location to another. It is also used to make copies of existing files.
examples
copy test.bat c:windows
copy *.txt c:

4) DATE command is used to display the system date and prompts the user to enter a new date.
examples
date
date /t

5) DEL (ERASE) command is used to permanently delete one or more files from the computer.
examples
del test.txt
del *.txt
del *

6) DIR The dir command provides a list of available files in the current and or parent directory.
examples
dir
dir /p
dir /a
dir d*

7) EDIT is a full-screen text editor, which is used to view, create and modify text files.
examples
edit myfile.txt

8) HELP command provides help about DOS commands.
examples
help
help dir
help date
date /?

9) MOVE command is used to move one or more files or directories from one location to another. It also used to renames the files or directories.
examples
move test.txt d:win
move d* d:win
move test.txt d: ewtest.txt

10) REN command is used to rename files and directories from the original name to a new name. unlike the move command, this command can not be used to rename subdirectories, or rename files across drives and can not specify a new drive or path for the destination of the renamed file.
examples
ren *.txt *.doc
ren test.txt newtest.txt

What is a batch file, give an example?

Batch files are special files with extension bat or cmd, which are often called scripts file that allows us to automate the task. Batch files contains a list of commands that are always executed together and in sequence, because we run the batch file as "command" instead of running each command individually.

We can create a batch file by using any text editor like the Notepad and by entering some lines of commands, and to save the file with an extension BAT or CMD.
To Run a batch file it require double clicking on it and it can also be run via command prompt or the windows start-Run line.

Example
Open the new text file and enter the following text in it and saved the file as "mybat.bat"-

@ECHO ON
REM This is an example of BAT file output.
@ECHO OFF
REM what we have...
Dir


This batch file contains two remarks i.e. "REM" which are used to provide notes or message by either the author or for the user of the file. Everything wrriten between the @ECHO On and off commands is displayed on the screen during the script's execution. After the second remarks/REM, there is a simple DOS "Dir" command which provide the lists the contents of the current directory.

Note that the individual commands or comments are separated by newlines which runs sequentially after double clicking on mybat.bat batch file.

How to run a Batch File?

A batch file can be run in two ways-

By command prompt as command
Double-clicking on the batch file

What is the difference between copy and copy con in DOS?

Copy is used to make a copy of a file. With this command, we can copy or append files with the same name or a new name in the current directory or any other location.
Examples-
copy a.txt b.txt
copy a.txt c.txt
copy a.txt+b.txt c.txt
copy c.txt d:

Copy con is also called copy console, it is used to write file. We can not use copy con to edit the file. After write in the file, CTRL Z is required to save and exit .
Examples-
copy con do.bat

@echo off
cls
echo This batch file does absolutly
echo nothing but print this line.
^z

CTRL Z ends the "writing" of the file.

What is chkdsk command?

Chkdsk is an abbreviation for check disk, used to check the status of the file system.

It scans the disk drive and helps in detecting error, repair and retrieval of data from bad sectors.

Examples
chkdsk
chkdsk d: / r
chkdsk d: / f
chkdsk *. *

What is AUTOEXEC.BAT file?

Autoexec.bat (Automatic execute batch) is a special plain-text batch file that is executed after system boot.
with this help, we can run commands, programs and batch files automatically at the time of startup or booting of the system, by adding them to this file.

Which is wild card character in DOS?

Wildcards are special characters and symbols that represent one or more characters. Commonly used wildcards are asterisk (*) and question mark (?).

An asterisk (*) is represents one or more characters, and a question mark (?) is represents a single character.

What is the xcopy command in dos?

The XCOPY command is used to copy one or more files and directories, including subdirectories from one location to another location.

Examples
xcopy c: est d: est /i
xcopy c: est d:

What is CONFIG.SYS?

Config.sys is a configuration file and it is executed during system boot.

It contains commands and instructions to load device drivers, lastdrive, shell, devicehigh, buffers etc. It also used to load programs in memory to manage memory,hardware, keyboard, mouse, printer, and other peripherals.

Config.sys is editable text file and it can be edit in any text-editing program.

After executing the command of the config.sys file, the autoexec.bat file is executed.

How we can create a directory in DOS?

MD or mkdir MS-DOS command can use to create a directory

Ex-
MKDIR dirname
MD dirname
md d:dirname

Explain the use of help DOS Command?

The help command provides more detailed information about other commands.

Ex-
HELP [command]
Help dir
Help time
Help

What is the full form of DOS?

The full form of DOS is Disk Operating System. This operating system works as a medium between user and computer system, and between hardware and software too.

Latest Updates

Fractions

First we increased the denominator of a positive fraction by 3 and then decrease it by 5.The sum of the resulting fractions proves to be equal to 2/3. Find the denominator of the fraction if its numerator is 2?

Simplification

If we divide a two digit number by the sum of its digits we get 4 as a quotient and 3 as a remainder. Now if we divide that two digit number by the product of its digits we get 3 as a quotient and 5 as a remainder . Find the two digit number?

Fractions

The denominators of an irreducible fraction is greater than the numerator by 2.If we reduce the numerator of the reciprocal fraction by 3 and subtract the given fraction from the resulting one,we get 1/15.Find the given fraction?

Simplification

If we add the square of the digit in the tens place of the positive two digit number to the product of the digits of that number we get 52,and if we add the square of the digit in the unit's place to the same product of the digits we get 117.Find the two digit number?

The sum of squares of the digits constituting a positive two digit number is 13, If we subtract 9 from that number we shall get a number written by the same digits in the reverse order. Find the number?

The arithmetic mean of two numbers is smaller by 24 than the larger of the two numbers and the GM of the same numbers exceeds by 12 the smaller of the numbers. Find the numbers?

A number being successively divided by 3,5,8 leaves remainder 1,4,7 respectively. Find the respective remainders if the order of divisors are reversed?

The sum of all possible two digit numbers formed from three different one digit natural numbers when divided by the sum of the original three numbers is equal to?

HCF and LCM

Find the HCF and LCM of the polynomial x2-5x+6 and x2-7x+10?

Simplification

When we multiply a certain two digit number by the sum of its digits , 405 is achieved. If we multiply the number written in reverse order of the same digits by the sum of the digits, we get 486. Find the number?

Average

The sum of two numbers is 15 and their geometric mean is 20% lower than their arithmetic mean. Find the numbers?

Numbers

The difference of 1025-7 and 1024+x is divisible by 3. find x=?

A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder . The number is?

The sum of three prime numbers is 100.If one of them exceeds another by 36 then one of the numbers is?

Find the number of zeros in the factorial of the number 18?

If a number is multiplied by 22 and the same number is added to it then we get a number that is half the square of that number. Find the number?

In doing a division of a question with zero remainder,a candidate took 12 as divisor instead of 21.The quotient obtained by him was 35. The correct quotient is?

Fractions

A number when divided by 342 gives a remainder 47.When the same number is divided by 19 what would be the remainder?

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