@echo off&setlocal enabledelayedexpansion
set "splitnum=要进行分割的行数"
set /a listnum=1
for /f "delims=" %%a in (a.txt) do (
  set /a n+=1
  >>split_!listnum!.txt echo %%a
  if !n! equ %splitnum% set /a listnum+=1,n=0
)
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