DOS External Command .

External Command : This command is not permanent part of the memory . To execute or run this command an external file required .
Example : [.] dot exe , bat.
Some commonly used DOS commands are .

1. CHKDSK
2. DISKCOPY
3. FORMAT
4. LABEL
5. SCANDISK
6. MOVE
7. PRINT
8. TREE
9. DELTREE

1. CHKDSK : The command CHKDSK returns the configuration status of 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:/> CHKSDK e :
  Note : If dive name is not mentioned by default current drive is considered . 
2. DISKCOPY : Disk copy command is used to make duplicate copy of the disk like Xerox copy . It first Formats the target disk and copies the file by collection . From the source disk and copied to the target disk . 
• Syntax :- C:/> disk copy  <source path> <destination path>
• ex :- C:/> diskcopy A : B :
  Note : This command is used after disk copy command to ensure that disk copied successfully . 
3. FORMAT : Format is used to erase information off of a computer diskette or fixed drive .
• Syntax :- C:/> format (drive name)
• ex :- C:/> format  A:
4. LABEL : This command is used to see volume label and to change volume label . 
• Syntax :- C:/> label (drive name)
• ex :- C:/> label A:
5. SCANDISK : This utility is used to repair and check various disk error . It also defects various physical disk errors and surface disk errors . 
• Syntax :- C:/> scandisk (drive name)
• ex :- C:/> scandisk  A:
6. MOVE : The purpose of move is move to files form one file to another place .
• Syntax :- C:/> move  <source path > <target path >
7. PRINT : This command allowed users to print a text to a line printer . 
• Syntax :- C:/> print (file name) 
• ex :- C:/> print ramu
8. TREE : This command display the list of directories and files in specified path using graphical display . It display a directories of files like a tree .
• Syntax : C:/> tree  > path
• ex :- C:/> tree A:
9. DELTREE : This files is used to delete files a  directories same as by DEL and RD commands because it completely removes specified directories i.e disk will all it files  and sub directories at a time .
• Syntax :- C:/> deltree >path
• ex:- C:/> deltree A:/> ramu

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Dos Internal command.