Batch - Converting variable to uppercase

Question

How would I go about changing the destl variable to uppercase before it is used. I assume some sort of character swap, however I couldn\'t get it working. C

Answer 1

I used 2 files, in the batch I called an external js and in the bat I assign the response to an internal var:

Bat:

@echo off
for /f %%i in ('cscript //nologo //E:jscript jsfile.js %1') do set VAR=%%i
echo %Var%

Js (jsfile.js in same directory):

WScript.echo(WSH.Arguments(0).toUpperCase())