Microsoft KB Archive/67929

= Rebooting from Within a Batch File =

Article ID: 67929

Article Last Modified on 5/12/2003

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APPLIES TO


 * Microsoft MS-DOS 3.3 Standard Edition
 * Microsoft MS-DOS 4.0 Standard Edition
 * Microsoft MS-DOS 4.01 Standard Edition
 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a
 * Microsoft MS-DOS 6.0 Standard Edition
 * Microsoft MS-DOS 6.2 Standard Edition
 * Microsoft MS-DOS 6.21 Standard Edition
 * Microsoft MS-DOS 6.22 Standard Edition

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This article was previously published under Q67929



SUMMARY
The MS-DOS batch language does not provide a means of restarting a system. However, it is possible to restart a system from within a batch file by calling an executable program that performs the task.

NOTE: This article provides instructions that you can use to create the REBOOT.COM file. These instructions have not been tested on all hardware configurations, and are provided &quot;as is&quot; with no warranty stated or implied.



MORE INFORMATION
The executable file can be created using DEBUG as follows:

 Start DEBUG by typing the following at the MS-DOS command prompt:

debug

  At the dash prompt, enter the following sequence of commands, each followed by pressing ENTER. (Comments are preceded by &quot;;&quot;.)   A 100                     ; Debug instruction for assemble MOV AH,0D                ; Disk Reset INT 21h                  ; causes SmartDrv 4.x to write cache MOV AX, 40               ; set up segment addressing MOV DS, AX  DS: OR BYTE PTR    [17],0C   ; equivalent of pressing CTRL+ALT MOV AX,4F53              ; Issue a &quot;DEL&quot; (53h = DEL scan code) INT 15h                  ; EMM386 sees this &amp; shuts down DS: MOV WORD PTR [72],1234   ; Set REBOOT flag to Warm-Boot (0=cold) JMP F000:FFF0            ; Execute the internal restart routine                      ; This line must be blank (just hit ENTER) R CX  20                        ; File size to be written to disk (in hex) N REBOOT.COM             ; Filename W                        ; Write the file to disk Q                        ; Quit Debug 

NOTE: The REBOOT.COM file created with this debug script is compatible with SMARTDrive and its write-behind cache feature. The instructions in REBOOT.COM cause SMARTDrive to write (flush) its write-behind cache to disk before the computer is rebooted.

This procedure creates the file REBOOT.COM in the current directory. At this point, you can call the file in the same manner as any other executable file, either from the command line or within a batch file, and the system will reboot.

Additional query words: 3.10 3.1 4.00 4.0 4.01 5.0 5.00 5.0a 5.00a 6.00 6.20

Keywords: KB67929

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