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5# superbat
你这样就试

:~!@#$%^&*()<>"/\|'=;
@echo off
set/p str=<%~fs0 >nul
setlocal enabledelayedexpansion
for /l %%a in (1 1 10) do (
     set "var="
     for /l %%b in (1 1 30) do (
        set/an=!random!%%21
        for %%c in (!n!) do set "var=!var!!str:~%%c,1!"
     )
     echo !var!
)
pause
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