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

Thanks for the responses guys, I solved it using this -

if not defined %~1 EXIT /b
for %%a in ("a=A" "b=B" "c=C" "d=D" "e=E" "f=F" "g=G" "h=H" "i=I"
        "j=J" "k=K" "l=L" "m=M" "n=N" "o=O" "p=P" "q=Q" "r=R"
        "s=S" "t=T" "u=U" "v=V" "w=W" "x=X" "y=Y" "z=Z" "ä=Ä"
        "ö=Ö" "ü=Ü") do (
call set %~1=%%%~1:%%~a%%
)
EXIT /b

I'm sure your responses are far neater and more efficient, but as mine is doing the trick and I don't want to break anything I will leave it as is!

Thank you for your input!