keen

用了三个for:

@echo off&setlocal enabledelayedexpansion
for /f %%i in ('dir /b') do (
    set str=%%~ni&set /a n+=1&set "space="
    for /f "skip=1 delims=:" %%j in ('^(echo !str!^&echo.^)^|findstr /o .*') do set b=%%j
    set /a c=21-!b!
    for /l %%k in (1 1 !c!) do set "space=!space! "
    set "str=!str!!space!"&set /p=!str!<nul
    set /a var=!n!%%4
    if !var!==0 echo\
)
pause>nul
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