CrLf

@echo off&setlocal enabledelayedexpansion
for /f %%a in ('find /c /v ""^<a.txt') do (
	for /l %%b in (1 1 %%a) do (
		set str=&set /p str=
		if !n! lss 8 echo;!str!
		if defined str if !str:^&^=! neq !str! set /a n+=1
	)
)<a.txt
pauseCOPY

再来个恶心的：

@echo off
for /f "tokens=1,2 delims=:" %%a in ('findstr /n "&" a.txt^|findstr /n .') do (
	echo %%a|find "8">nul&&for /f %%a in ('find /c /v ""^<a.txt') do set /a n=%%a-%%b
)
set n|findstr "^n=">nul 2>&1&&sort /+128 a.txt|more +%n%|sort /+128
pauseCOPY