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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-
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
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.
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.
Describe the 10 DOS commands?
The 10 DOS command are-
Tell about networking related DOS commands?
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.
@ECHO ON REM This is an example of BAT file output. @ECHO OFF REM what we have... Dir
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
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.
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 .
@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.
What is AUTOEXEC.BAT file?
Autoexec.bat (Automatic execute batch) is a special plain-text batch file that is executed after system boot.
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.
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.
|Height and Distance|
An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60º and 45º respectively. What is the height of the lower plane from the ground?
From the top of a building 90 m high, the angles of depression of the top and the bottom of a tree are 30º and 45º respectively. What is the height of the tree?
What is the value of sinx √( 1 /1+cosx + 1 /1-cosx ) ?
What is cos4 A - sin4 A / cos2 A - sin2 A equal to?
If 7sin2 x +3cos2 x = 4, 0 < x < 90º ,then what is the value of tan x?
If x = a cosθ + b sinθ and y = a sinθ - b cosθ then what is x2 + y2 equal to?
The mean of 5 numbers is 15. If one more number is included, the mean of the 6 numbers becomes 17. What is the included number?
The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are?
In an asymmetrical distribution, of the mean and median of the distribution are 270 and 220 respectively, then the mode of the data is?
Let a, b, c, d, e, f, g be consecutive even numbers and j, k, l, m, n be consecutive odd numbers. What is the average of all the numbers?
|Alligation or Mixture|
25 kg of alloy X is mixed with 125 kg of alloy Y. If the amount of lead and tin in the alloy X is the ratio 1 : 2 and the amount of lead and tin in the alloy Y is in the ratio 2 : 3, then what is the ratio of lead to tin in the mixture?
The ratio of two numbers is 1 : 5 and their product is 320. What is the difference between the square of these two numbers?
What is the value of cot 4π/3 ?
Article-24 of the Indian Constitution ‘Prohibition of employment of children in factories, etc’ deals with?
Article-134A of the Indian Constitution ‘Certificate for appeal to the Supreme Court’ deals with?
Who invented Aspirin?
A larger force on a rotating body results in larger?
What is the unit of the physical quantity, magnetic flux density?
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