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DOS Commands are of two types:
• Internal Command
• External Command
INTERNAL commands
Internal commands do not required any special files for being executed and are brought into the computer’s memory as soon as the computer is switched on.
Internal commands are memory resident commands. They are resident in the memory when the COMMAND.COM is loaded in the boot up process.
The list of internal commands.
List of Internal Commands.
1. BREAK Sets or clears extended CTRL+C checking.

2. CALL Calls one batch program from another.

3. CHCP Displays or sets the active code page number.

4. CHDIR Displays the name of or changes the current directory.

5. CD Displays the name of or changes the current directory.

6. CLS Clears the screen.

7. COPY Copies one or more files to another location.

8. CTTY Changes the terminal device used to control your system.

9. DATE Displays or sets the date.

10. DEL Deletes one or more files.

11. ERASE Deletes one or more files.

12. DIR Displays a list of files and subdirectories in a directory.

13. ECHO Displays messages, or turns command echoing on or off.

14. EXIT Quits the COMMAND.COM program (command interpreter).

15. FOR Runs a specified command for each file in a set of files.

16. GOTO Directs MS-DOS to a labelled line in a batch program.

17. IF Performs conditional processing in batch program.

18. LOADHIGH Loads a program into the upper memory area.

19. LH Loads a program into the upper memory area.

20. MKDIR Creates a directory.

21. MD Creates a directory.

22. PATH Displays or sets a search path for executable files.

23. PAUSE Suspends processing of a batch file and displays a message.

24. PROMPT Changes the MS-DOS command prompt.

25. REM Records comments (remarks) in a batch file or config.sys.

26. RENAME Renames a file or files.

27. REN Renames a file or files.

28. RMDIR Removes a directory.

29. RD Removes a directory.

30. SET Displays, sets, or removes MS-DOS environment variables.

31. SHIFT Changes the position of replaceable parameters in a batch file.

32. TIME Displays or sets the system time.

33. TYPE Displays the contents of a text file.

34. VER Displays the MS-DOS version.

35. VERIFY Directs MS-DOS to verify that your files are written correctly to a disk.

36. VOL Displays a disk volume label and serial number.

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