How to pass/retrieve DOS command-line parameters in a 16-bit assembly program?

Question

I am writing some little tools for MS-DOS. Now I\'m writing a Shutdown.com, like for Windows XP and greater. I have already written the entire code, now I just need

Answer 1

According to this site, the length of the command-line is stored at DS:80h (single byte), and the actual command line itself starts at DS:81h. Here's some example code from that article that prints the command line:

; ----------------------------------------------------------------------------
; echo.asm
;
; Echoes the command line to standard output.  Illustrates DOS system calls
; 40h = write to file, and 4ch = exit process.
;
; Processor: 386 or later
; Assembler: MASM
; OS: DOS 2.0 or later only
; Assemble and link with "ml echo.asm"
; ----------------------------------------------------------------------------

        .model  small
        .stack  64                      ; 64 byte stack
        .386
        .code
start:  movzx   cx,byte ptr ds:[80h]    ; size of parameter string
        mov     ah, 40h                 ; write
        mov     bx, 1                   ; ... to standard output
        mov     dx, 81h                 ; ... the parameter string
        int     21h                     ; ... by calling DOS
        mov     ah, 4ch
        int     21h
        end     start