List of DOS Command

1. ASSOC Displays or modifies file extension associations.
2. AT Schedules commands and programs to run on a computer.
3. ATTRIB Displays or changes file attributes.
4. BREAK Sets or clears extended CTRL+C checking.
5. CACLS Displays or modifies access control lists (ACLs) of files.
6. CALL Calls one batch program from another.
7. CD Displays the name of or changes the current directory.
8. CHCP Displays or sets the active code page number.
9. CHDIR Displays the name of or changes the current directory.
10. CHKDSK Checks a disk and displays a status report.
11. CHKNTFS Displays or modifies the checking of disk at boot time.
12. CLS Clears the screen.
13. CMD Starts a new instance of the Windows command interpreter.
14. COLOR Sets the default console foreground and background colors.
15. COMP Compares the contents of two files or sets of files.
16. COMPACT Displays or alters the compression of files on NTFS partitions.
17. CONVERT Converts FAT volumes to NTFS. You cannot convert the
18. current drive.
19. COPY Copies one or more files to another location.
20. DATE Displays or sets the date.
21. DEL Deletes one or more files.
22. DIR Displays a list of files and subdirectories in a directory.
23. DISKCOMP Compares the contents of two floppy disks.
24. DISKCOPY Copies the contents of one floppy disk to another.
25. DOSKEY Edits command lines, recalls Windows commands, and creates macros.
26. ECHO Displays messages, or turns command echoing on or off.
27. ENDLOCAL Ends localization of environment changes in a batch file.
28. ERASE Deletes one or more files.
29. EXIT Quits the CMD.EXE program (command interpreter).
30. FC Compares two files or sets of files, and displays the differences
31. between them.
32. FIND Searches for a text string in a file or files.
33. FINDSTR Searches for strings in files.
34. FOR Runs a specified command for each file in a set of files.
35. FORMAT Formats a disk for use with Windows.
36. FTYPE Displays or modifies file types used in file extension associations.
37. GOTO Directs the Windows command interpreter to a labeled line in a
38. batch program.
39. GRAFTABL Enables Windows to display an extended character set in graphics
40. mode.
41. HELP Provides Help information for Windows commands.
42. IF Performs conditional processing in batch programs.
43. LABEL Creates, changes, or deletes the volume label of a disk.
44. MD Creates a directory.
45. MKDIR Creates a directory.
46. MODE Configures a system device.
47. MORE Displays output one screen at a time.
48. MOVE Moves one or more files from one directory to another directory.
49. PATH Displays or sets a search path for executable files.
50. PAUSE Suspends processing of a batch file and displays a message.
51. POPD Restores the previous value of the current directory saved by PUSHD.
52. PRINT Prints a text file.
53. PROMPT Changes the Windows command prompt.
54. PUSHD Saves the current directory then changes it.
55. RD Removes a directory.
56. RECOVER Recovers readable information from a bad or defective disk.
57. REM Records comments (remarks) in batch files or CONFIG.SYS.
58. REN Renames a file or files.
59. RENAME Renames a file or files.
60. REPLACE Replaces files.
61. RMDIR Removes a directory.
62. SET Displays, sets, or removes Windows environment variables.
63. SETLOCAL Begins localization of environment changes in a batch file.
64. SHIFT Shifts the position of replaceable parameters in batch files.
65. SORT Sorts input.
66. START Starts a separate window to run a specified program or command.
67. SUBST Associates a path with a drive letter.
68. TIME Displays or sets the system time.
69. TITLE Sets the window title for a CMD.EXE session.
70. TREE Graphically displays the directory structure of a drive or path.
71. TYPE Displays the contents of a text file.
72. VER Displays the Windows version.
73. VERIFY Tells Windows whether to verify that your files are written
74. correctly to a disk.
75. VOL Displays a disk volume label and serial number.
76. XCOPY Copies files and directory trees.

Some common error in Pc With Their solution

1. MONITOR LED IS BLINKING

                                   Check all the connections like Monitor Cable, Data cables,RAM,    Display      Card , CPU connections.

2. CONTINUOS THREE BEEPS

         Problem in RAM Connection.

3. THREE BEEPS ( 1 Long 2 Short)

          Problem in Display Card Connection

4. THREE LONG BEEPS PERIOD WISE

          Problem in BIOS or RAM (Basic Input Output System)

5. CONTINUOS NON-STOP BEEPING

        Key Board Problem (I.e.; Some Key is pressed for Longer time)

6. FDD LED IS GLOWING CONTINUOSLY

          Data cable to be connected properly (twisted cable).

7. NO DISPLAY ON THE SCREEN AT ALL

                                     Hard Disk cable connected wrongly. Connect rightly seeing the Red  mark   (Faces power supply) and then Restart.

8. POWER LED IS OFF

• Check main power cord
• Check S.M.P.S.
• Check Mother Board connection

9. SHOWING CMOS ERROR

Replace 3 Volt battery of Mother Board . Set Original Settings Manually.(Refer CMOS Setup chart)
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10. SHOWING FDD ERROR OR FLOPPY DRIVE IS NOT WORKING PROPERLY

Check Power cord of FDD , Data Cables , set CMOS & Finally the Check drive.

11. SHOWING HDD ERROR OR HARD DISK FAILURE

• Check Power Cord
• Check connection of HDD
• Check Data cable
• Check Hard Disk parameters in CMOS or Auto detecting Setting Partitions by Fdisk Command, then format it to set track 0.

12. MOTHER BOARD HANGS DUE TO UNSTABILIZED POWER SUPPLY

• Check S.M.P.S
• RAM not functioning properly.
• Software problem (due to using pirated software)
• CPU fan not functioning properly.

13. DANCING SCREEN

• Check Display card connection
• Virus Problem
• Video Memory Problem

14. SHAKING SCREEN

• Earthing problem
• Magnetic waves comes around.

15. CPU CABINET SHOCK

• Check Earthing
• Check main power cord.

16. NON-SYSTEM DISK ERROR

• Floppy Drive having different disk (Non-Bootable Disk) OR CMOS Parameters for Hard Disk may not be set properly.
• Hard Disk Partitions may not be created.
• Hard Disk may not be formatted.

17. MISSING OPERATING SYSTEM
The System files missing namely Ie; command.com} - User File IO.SYS & MS_DOS.SYS } - Hidden Files. These above three files required for Start up of the system that can be transferred by using SYS C: Command OR While the time of formatting by using Format c:/u/s

18. MISSING COMMAND INTERPRETOR

May the file Command.com is corrupted OR Infected by Virus OR Some one has Erased it.

19. SHOWING I/O ERROR

• The type of Hard Disk in CMOS may not be set properly.
• Operating system used for formatting is not valid

20. SHOWING DIVIDE OVER- FLOW MESSAGE

• May some Directories or Files crash with other files.
• Use CHKDSK/F or SCANDISK Command to correct it.

21. HARD DISK MAKING NOISE WHILE PROCESSING

• Unstabilized power supply.
• Check for Loose Contact.
• Do not use Y Connectors for Hard Disk.
• It may create Bad Sector OR Weak Hard Disk.

22. HARD DISK HANGS WHILE PROCESSING

Check for Bad Sector by using CHKDSK or SCANDISK Command. If found format the Hard Disk and set Partition before that area.(This is the only procedure to use Hard Disk with Bad Sector) OR (To avoid Bad Sectors use Standard Power Supply)

23. HARD DISK NOT DETECTED

• Check Power Connector
• Check Data Cables
• Check Jumpers

24. PARTITION NOT SHOWN

Operating System where the Hard Disk formatted is not supported with present Mother Board. For Eg: Hard Disk formatted with Pentium System will hide their partitions for 486 System.

25. MMX/DLL FILE MISSING

May the above files may be corrupted due to power failure or Virus. Make available above files from other Computer. OR Reinstall Windows 98 Operating System. (This procedure will not make any effect on existing Data).

26. WINDOWS REGISTRY ERROR

This will happen due to sudden ON/OFF of the system. Final solution is to Reinstall Operating System.

27. DISPLAY COLOUR DOES NOT MATCH

• Configure Display Card properly with their CD.
• The Standard setting for Windows is set it to 800x600 for better performance.

28. UNKNOWN DEVICE FOUND

May the Driver utility is not provided with operating system . Insert Driver CD and install software for the above Device. (Every Device requires driver utility to set active