@echo off
cd /d "%~dp0"
for %%A in (*.txt) do (
  call :randomFileName 10 "%%A"
)
pause
exit /b
:randomFileName
setlocal EnableDelayedExpansion
::---------生成随机文件名。
::---------%1为密码长度，%2为原文件名。
if "%~1"=="" goto :eof
if %~1 lss 1 goto :eof
if  "%~2"=="" goto :eof
set wordset=abcdefghijklmnopqrstuvwxyz0123456789
set password_len=%1
set return=
::---------------------------循环
:loop
set /a "numof=%random%%%36"
set return=%return%!wordset:~%numof%,1!
set /a password_len-=1
if %password_len% gtr 0 goto loop
::---------------------------循环
if exist "%return%%~x2" goto randomFileName
echo ren %2 "%return%%~x2"
ren %2 "%return%%~x2"
endlocal
goto :eof
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