apang

@echo off
set /a n=-1
for /f "delims=" %%a in (a.txt) do (
   set /a n+=1,Name=n/5 + 1
   set "str=%%a"
   setlocal enabledelayedexpansion
   echo,!str!>>"a_!Name!.txt"
   endlocal
)
pause
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