@ECHO OFF
IF NOT "%OS%"=="Windows_NT" GOTO Syntax
IF      "%~1"==""           GOTO Syntax
IF NOT  "%~2"==""           GOTO Syntax

SETLOCAL ENABLEDELAYEDEXPANSION
SET /A Num = %~1
SET Oct=

:Loop
SET /A "OctTmp = Num %% 8"
SET /A Num /= 8
SET Oct=%OctTmp%%Oct%
IF %Num% GTR 0 GOTO Loop

ECHO.%Oct%

ENDLOCAL
GOTO:EOF


:Syntax
ECHO.
ECHO Num2Oct.bat,  Version 1.01 for Windows NT4 and later
ECHO Convert the specified number to octal
ECHO.
ECHO Usage:  NUM2OCT  number
ECHO.
ECHO Where:  number   is a decimal or hexadecimal number
ECHO                  (0xnnn for hexadecimal)
ECHO.
ECHO Note:   Non-numeric input will be treated as 0
ECHO.
ECHO Written by Rob van der Woude
ECHO http://www.robvanderwoude.com

IF "%OS%"=="Windows_NT" EXIT /B 1