How to get the output of a command using batch script

- 
@ECHO OFF
IF NOT "%1"=="" GOTO ADDV
SET VAR=
FOR /F %%I IN ('DIR *.TXT /B /O:D') DO CALL %0 %%I
SET VAR
GOTO END

:ADDV
SET VAR=%VAR%!%1

:END

Reference 

http://stackoverflow.com/questions/108439/how-do-i-get-the-result-of-a-command-in-a-variable-in-windows

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