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Rebooting from Within a Batch File

This article was previously published under Q67929
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
SUMMARY
The MS-DOS batch language does not provide a means of restarting asystem. However, it is possible to restart a system from within abatch file by calling an executable program that performs the task.

NOTE: This article provides instructions that you can use to createthe REBOOT.COM file. These instructions have not been tested on allhardware configurations, and are provided "as is" with no warrantystated or implied.
MORE INFORMATION
The executable file can be created using DEBUG as follows:

  1. Start DEBUG by typing the following at the MS-DOS command prompt:
    debug
  2. At the dash prompt, enter the following sequence of commands, each followed by pressing ENTER. (Comments are preceded by ";".)
       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 "DEL" (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   <CR>                      ; 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 compatiblewith SMARTDrive and its write-behind cache feature. The instructionsin REBOOT.COM cause SMARTDrive to write (flush) its write-behind cacheto 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 otherexecutable file, either from the command line or within a batch file,and the system will reboot.
3.10 3.1 4.00 4.0 4.01 5.0 5.00 5.0a 5.00a 6.00 6.20
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Article ID: 67929 - Last Review: 05/12/2003 20:42:43 - Revision: 2.0

  • 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
  • KB67929
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