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

This is pointless since env var names and file names are both case insensitive. But if you insist you can do it like this:

@echo off

setlocal enabledelayedexpansion
set lower=john smith 123
set alpha=ABCDEFGHIJKLMNOPQRSTUVWXYZ
set i=0
:letter
set !alpha:~%i%,1!_=!alpha:~%i%,1!
set /a i += 1
if %i% LSS 26 goto letter
set i=0
set upper=
:uppercase
set let=!lower:~%i%,1!
if "%let%" == "" goto done
if defined %let%_ (set upper=%upper%!%let%_!) else (set upper=%upper%%let%)
set /a i += 1
goto uppercase
:done
echo %upper%