@echo off&setlocal enabledelayedexpansion
:a
set /a n1=%random%%%25+1
set n2=0
for /f "tokens=*" %%a in ('sort /+%n1% 1.txt') do (
set /a n2+=1
if !n2! gtr 10 goto jieshu
echo %%a
)
:jieshu&pause&goto a
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@echo off
:lp
set /a m+=1
if %m% equ 10 del /q tmp&pause&exit/b
set /a n=%random%%%12+1
(more +%n% 1.txt)>tmp
set /p str=<tmp
echo %str%
goto lp
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@echo off&setlocal enabledelayedexpansion
set /a n=10
for /f "tokens=2 delims=:" %%a in ('find /v /c "" a.txt')do set/a h=%%a

for /l %%a in (1,1,%n%) do (
    set/a v=!random!%%h+1
    for /l %%b in (1,1,%n%) do (
        if defined tem!v! (set /a v=v%%n+1)
    )
    set tem!v!=y
    set var=!var! !v!:
)
for /f "tokens=1* delims=:" %%a in ('findstr /n .* a.txt^|findstr /b "!var!"') do echo %%b
pause
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