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Describe the 10 DOS commands?
The 10 DOS command are-
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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.
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.
How we can create a directory in DOS?
MD or mkdir MS-DOS command can use to create a directory
Explain the use of help DOS Command?
The help command provides more detailed information about other commands.
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.
|Pipes and Cistern|
Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A s opened first, in how many hours, the tank shall be full?
A large tanker can be filled by two pipes A and B in 60 min and 40 min respectively. How many minutes will it take to fill the tanker from empty state if B is used for first half of the time, and A and B fill it together for the other half?
A tank is filled by 3 pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The 2nd pipe fills the tank 5 hours faster than first pipe and 4 hours slower than third pipe. The time required by first pipe is?
Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min?
Two pipes A and B can fill a tank in 36 min and 45 min respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. after 7 min, C is also opened. In how much time, the tank is full?
Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 min more to fill the cistern. When the cistern is full, in what time will the leak empty it?
Bucket P has thrice the capacity as Bucket Q. It takes 60 turns for Bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?
In a class , 30 % of the students offered English, 20 % offered Hindi and 10 % offered Both.If a student is offered at random, what is the probability that he has offered English or Hindi?
In a lottery ,there are 10 prizes and 25 blanks.A lottery is drawn at random. what is the probability of getting a prize ?
Two dice are thrown simultaneously .what is the probability of getting two numbers whose product is even?
Two diced are tossed the probability that the total score is a prime number?
Two cards are drawn at random from a pack of 52 cards What is the probability that either both are black or both are queens?
Two dice are thrown together .What is the probability that the sum of the number on the two faces is divisible by 4 or 6?
A bag contains 6 white and 4 black balls .Two balls are drawn at random .Find the probability that they are of the same colour?
In a simultaneous throw of a pair of dice,find the probability of getting a total more than 7?
An unbiased die is tossed.Find the probability of getting a multiple of 3?
|Problems on Ages|
My brother is 3 years elder to me. My father was 28 years of age when my sister was born while my mother was 26 years of age when i was born. If my sister was 4 years of age when my brother was born,then what was the age my father and mother respectively when my brother was born?
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