Computer Science, asked by poojaverma3623, 1 year ago

Dos? what is dos? explain internal and external commands of dos with an

Answers

Answered by VrandaARastogi
0
DOS vs UNIX

In today’s modern computing world, seeing a text-based interface can be quite daunting. Many people can’t even tell one from the other. DOS and UNIX are two operating systems that are predominantly text based. Although they might look similar, there are a lot of differences between them. Let’s start off with the GUI. DOS doesn’t have its own GUI so you are restricted to the command line. In contrast, UNIX can have a GUI just like most Linux variants. Most people who have UNIX setups forego the GUI to maximize performance.

The primary advantage of UNIX over DOS is its security. Although it greatly adds to the complexity of the operating system, it is essential for an operating system that is mainly used as a server. DOS was meant to be an operating system for personal computers and sacrificed security to make it easier to use.

There are a couple of usage differences between DOS and UNIX. The first difference is the case sensitivity of UNIX but not DOS. So in UNIX, the files example.exa and Example.exa can exist in the same folder but not in DOS. As long as the filename has the same characters, they would be considered as identical by DOS. The second, and less consequential of the two, is the use of slashes. DOS uses backslashes (\) to separate directories. In contrast, UNIX uses forward slashes (/) in its directory structure. These are just things to remember if you are familiar with one or the other.

The differences between UNIX and DOS are largely attributed to what they were meant to do. Nowadays, UNIX is still used with servers due to its light and performance-oriented nature. Only a handful of people have the ability to work with it. Although DOS was initially meant for personal computers, it has been replaced by more intuitive and easier-to-use operating systems like Windows, OS X, and even Linux. The only niche where DOS is still used is in embedded systems largely due to its very minimal requirements.
DOS vs UNIX

In today’s modern computing world, seeing a text-based interface can be quite daunting. Many people can’t even tell one from the other. DOS and UNIX are two operating systems that are predominantly text based. Although they might look similar, there are a lot of differences between them. Let’s start off with the GUI. DOS doesn’t have its own GUI so you are restricted to the command line. In contrast, UNIX can have a GUI just like most Linux variants. Most people who have UNIX setups forego the GUI to maximize performance.

The primary advantage of UNIX over DOS is its security. Although it greatly adds to the complexity of the operating system, it is essential for an operating system that is mainly used as a server. DOS was meant to be an operating system for personal computers and sacrificed security to make it easier to use.

There are a couple of usage differences between DOS and UNIX. The first difference is the case sensitivity of UNIX but not DOS. So in UNIX, the files example.exa and Example.exa can exist in the same folder but not in DOS. As long as the filename has the same characters, they would be considered as identical by DOS. The second, and less consequential of the two, is the use of slashes. DOS uses backslashes (\) to separate directories. In contrast, UNIX uses forward slashes (/) in its directory structure. These are just things to remember if you are familiar with one or the other.

The differences between UNIX and DOS are largely attributed to what they were meant to do. Nowadays, UNIX is still used with servers due to its light and performance-oriented nature. Only a handful of people have the ability to work with it. Although DOS was initially meant for personal computers, it has been replaced by more intuitive and easier-to-use operating systems like Windows, OS X, and even Linux. The only niche where DOS is still used is in embedded systems largely due to its very minimal requirements.

Answered by Anonymous
0
Command is an instruction written in a computer acceptable language that user types on the dos prompt. It will execute and do the appropriate action. There are mainly two types of dos command.


1.Internal commands: The internal commands are those commands that are automatically loaded in the memory. Some commonly used DOS internal commands are
                   

Dir:- It displays the list of directories and files on the screen.


Syntax:- C : / > dir.

     a. C : / > dir/p – It displays the list of directories or files page wise

     b. C: / > dir/w- It displays the list of directories or files width wise

     c. C : / > dir/d: –It display list of directories or files in drive D

     d. C : / > dir filename . extension – It displays the information of specified file.

     e. C : / > dir file name with wild cards

External commands: -  This commands are not permanent part of the memory. To execute or run this commands an external file is required.


Example : [.] Dot  exe, bat.

Some commonly used DOS external commands are .

CHKDSK:- The command CHSDK returns the configuration status of the selected disk. It returns the information about the volume, serial number, total disk space, space in directories, space in each allocation unit, total memory and free memory.


Syntax : - C : / > CHKDSK drive name

Eg:- C : / > CHKDSK   e :

If drive name is not mentioned by default current drive is considered.


i hope its help you
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