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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.
|General Knowledge of India|
Which of the following dance forms was introduced by the great Vaishnava saint and reformer Mahapurusha Sankaradeva ?
Which of the following is the only classical dance of india having links with Muslim culture and represents a unique synthesis of Hindu and Muslim genius in art ?
|Time and Distance|
Starting from the same point at the same time, Ruhan and Yuvan had to reach the same destination. While Ruhan drove at 45 km/hr, Yuvan was slower by 5 km/hr. If Yuvan arrived at the destination an hour after Ruhan did, the distance covered by each, in Kilometres, was ?
A sum of money was invested at a certain rate of simple interest for 4 years. Had the sum been invested at a rate 3% higher than the actual rate, the interest earned would have been 720 Rs more. Find the sum initially invested?
|Ratio and Proportion|
A bag contains red, blue and black balls. The ratio of red to blue balls is 3 : 5. The ratio of black to red balls is 3 : 4. What is the ratio of blue to black balls?
|Profit and Loss|
Selling a pack of incense sticks for 136 Rs resulted in a loss of 15%. To make a profit of 10%, the selling price should be ?
23% of a bucket full of diluted milk was water. If the quantity of pure milk in the bucket was 15.4 liter, then the capacity of the bucket was ?
The average of the marks obtained by three girls in a test was twice the average of the marks obtained by eight boys in that test. If the total marks obtained by all these examinees was 168, find the average marks each of the girls obtained ?
|Pipes and Cistern|
44 pipes can fill a large water tank in 27 hours. How many hours it take for 66 pipes to fill four such tanks ?
|HCF and LCM|
A natural number, when divided by 3, 4, 5, 6, and 7 respectively, leaves corresponding remainder of 2, 3, 4, 5 and 6. What is the smallest of all such numbers fulfilling the above condition ?
If in a certain code language, PRINT is written as 34825 and TRUE is written as 5479. Then, how will TENURE be written in that language?
Arrange the given words from smallest to biggest-
|Statement and Conclusion|
The difference between the place value of 4 and 2 in the number 833749502 is ?
GIKM : HJLN :: PRTV : .........?
In a row of girls, Nanda is eighth from the left and Chanda is nineteenth from right. When Nanda and Chanda interchange their positions, Chanda becomes twnty-third form right. How many girls are there in the row?
Summer: Day :: Winter : ........?
Bird:Winges :: Fish:........?
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