[文本处理] [已解决]批处理每隔X行添加字符与空格

@echo off
set /a n=0,x=3
setlocal enabledelayedexpansion
(for /f "delims=" %%a in (a.txt) do (
if !n!==0 echo ^ 
set /a n+=1,m=n%%x
echo,%%a
if !m!==0 echo,&echo,&echo,^ 
))>#a.txt
pause
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