smss

@echo off&setlocal EnableDelayedExpansion
for /f "delims=" %%a in ('dir/b/s *.txt') do (set /a m=0,n=0
for /f "usebackq delims=" %%i in ("%%a") do (set /a n=n%%3+1,m+=1
if !m! equ 1 (>"%%a" echo %%i) else (>>"%%a" echo %%i
if !n! equ 3 echo -------------------------我是分割线------------------------->>"%%a"
)))
echo 处理完毕
pause
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