Definition of DOS and Function Key

Definition DOS Function Key


To return the command that was run at the end one by one at the prompt. We can do the same thing with Arrow Key.  Definition DOS Function Key.

Definition DOS Function Key
Definition DOS


The command is use at the end. Let us use that command again to return to the same prompt.


The command use by it at DOS prompt can be view one by one.

Note – It’s necessary that dos key command is use first.


Used to see the used commands one by one in reverse order. Which command is run at the end? suddenly which one.

Note- It’s necessary that the dos key command is use first. Definition DOS directory.


Used to run the command of a particular number of commands used. Then as soon press key. The Line number will be write at the command prompt. Now the number we want to work for.

If you enter that number by writing it will work. Definition of DOS and Function Key.

Note- It is necessary that the dos key command is use first.

Ctrl+C: – Use the Command to stop this work at the same them.

Ctrl+M:- It can be use instead of enter key. That is when the enter button goes bad.

So you can be use this instead. Such commands given to the computer are call. Which makes the computer fit to work?

DOS is one such system to run disks. That controls all the computer’s information. DOS is a broadcast form of the Disk Operating System.

Note – Currently two different company made operating systems are being use. Which is equal on the basis of work.

(1) MS-DOS (Microsoft Disk Operating System) (2) PC-DOS (Personal Computer Disk Operating System).

Disk Operating System DOS

Things that are require to start after the computer gets power. He is the DOS Operating System. The Device can’t be boot until then MS DOS is load into the system.

A computer requires three files to boot. He is MS DOS.SYS, IO.SYS, COMMAND.COM. The computer boots after reading these three files. And if the first two files are finish. The Non-System Disk command is write on the screen.

MS office in hindi

And if the command dot com file is finish. That missing command Interpret command is write. all three files are present, after booting, a special mark (C: >) appears on the screen called prompt. From this trail, we can find two things.

(1) Getting ready to do computer work. (2) On which disk is Drive working. Eg-hard disk.

Note – For running any command of DOS, it is necessary that Prompt is already present on the screen. Definition DOS Function Key

Command Prompt

Command prompt is command line interpreter application. Can be form A to Z. But usually 4 types of prompts are use. If the hard disk partition is not create.

A:\> and B:\> use for floppy disk. C:\> prompt for Hard disk. D:\> Prompt for CD rom etc.

There are two things in a computer.

1- File 2- Directory 

MS DOS Computer Command

File: – Which we write our information? it is call a file, which ever is the way?we use copy or paper to write?

In the same way one file in computer is use to write information.

Directory: – The file in which we save is directory or folder. The way we use the receptacle for the protection of Device. Directory used in that same way to protect files.

Name of File 

There are two types of names of files in a computer.

1) General (2) Extension uses dot to make a connection between these two names. The first name called general name. Which given in maximum eight character and another name is call extension?

Which is only in three letters? Through this, we find out the type of files. What kind of file is this? Such as inp, cdr, com, bat, exe etc. Definition DOS Function Key.

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