Присвоить переменной в качестве значения строку, выводимую в результате выполнения программы

echo off
setlocal enableextensions
 
for /r "D:\Texture" %%i in ("*.tga") do (
    For /F "Delims=" %%I In (
        'identify -format "%%[fx:w-2]x%%[fx:h-2] " %%i'
    ) Do Set "SIZE=%%~I"
    convert -resize "%SIZE%" %%i %%i
)
 
exit /b

echo on
setlocal enableextensions
 
for /r "D:\Texture" %%i in ("*.tga") do (
    echo %%1
    For /F "Delims=" %%I In (
        'identify -format "%%[fx:w-2]x%%[fx:h-2] " %%i'
    ) Do Set SIZE=%%~I
    convert -resize %SIZE% %%i %%i
)
 
exit /b

@echo off
setlocal EnableDelayedExpansion
 
Set prg=nconvert_x86.exe
If Defined PROCESSOR_ARCHITEW6432 (Set prg=nconvert_x64.exe) Else (If "%PROCESSOR_ARCHITECTURE%"=="AMD64" Set prg=nconvert_x64.exe)
 
set w=%~1
set h=%~2
 
if not defined w echo не введёна ширина& pause& exit /b
if not defined h echo не введёна высота& pause& exit /b
 
for /d %%a in ("%pSFX%\*") do (
for /f "delims=" %%b in ('dir /b /a-d "%%a"') do (
"%pTMP%\%prg%" -resize %w% %h% -o "%%a_%w%x%h%\%%" "%%a\%%b"
))

echo off
setlocal enableextensions
 
for /r "D:\Texture" %%i in ("*.tga") do (
    For /F "Delims=" %%I In (
        'identify -format "%%[fx:w-2]x%%[fx:h-2] " %%i'
    ) Do Set "SIZE=%%~I"
    call convert -resize "%%SIZE%%" %%i %%i
)
 
exit /b

echo on
setlocal enableextensions enabledelayedexpansion
 
for /r "c:\Users\Vlad\Documents\ATLAS\Textures" %%i in ("*.tga") do (
    echo %%1
    For /F "Delims=" %%I In (
        'identify -format "%%[fx:w-2]x%%[fx:h-2] " %%i'
    ) Do Set SIZE=%%~I
    convert -resize !SIZE! %%i %%i
)
 
exit /b