@echo off
cd /d "."
:1
cls
for /f "delims=: tokens=2" %%a in ('find /c /v "" 1.txt') do set n=%%a
set /a m=%random% %% n
if %m%==0 (set skip=) else set skip=skip=%m%
for /f "%skip% delims=" %%a in (1.txt) do set "str=%%a" & goto end
:end
echo %str%
Pause
goto 1