zerofile.cmd

@echo off

if "%~1" EQU "" (
    echo No arguments. Use  "%~n0%~x0  <filename> <size> [K|M]"
    exit /b 1
)

if "%~1" EQU "/?" (
    echo Use  "%~n0%~x0  <filename> <size> [K|M]"
    exit /b 1
)

if "%~1" EQU "%~n1%~x1" (
    set FILENAME=%CD%\%~1
) else (
    set FILENAME=%~1
)

set FILESIZE=%~2
set ED=%~3

set /a "RES=FILESIZE+1-1"
if %RES% LEQ 0 (
    echo Can't create file with size %RES%
    exit /b 2
)

if "%ED%" EQU "K" goto :kb
if "%ED%" EQU "M" goto :mb
if "%ED%" EQU "k" goto :kb
if "%ED%" EQU "m" goto :mb
goto :create

:kb
    set /a "RES=FILESIZE*1024"
    set ST=%FILESIZE% Kb
    goto :create

:mb
    set /a "RES=FILESIZE*1024*1024"
    set ST=%FILESIZE% Mb

:create
    echo Creating file: %FILENAME%
    if "%ST%" EQU "" (
        echo Size:      %RES% bytes
    ) else (
        echo Size:      %ST% [%RES% bytes]
    )

    wsudo fsutil file createnew "%FILENAME%" %RES%