tkaven

@echo off&color a&setlocal enabledelayedexpansion
::用法 call :insert "要修改的本文文档路径" "在哪一行下面插入文字" "所要插入的文字"
call :insert "C:\Users\Administrator\Desktop\新建 Text Document.txt" "5" "我好喜欢你啊，哈哈哈"
endlocal
echo 操作完成,按任意键退出&pause>nul
exit

:insert
FOR /F %%l in ('find /c /v ""^< %1') do (
	for /l %%a in (1 1 %%l) do (
		set /p str=
		set /a 当前行=当前行+1
		if !当前行! GTR %~2 (
			echo.!str!
			) else (
			if !当前行! EQU %~2 (echo.!str!&echo.%~3) else (echo.!str!)
		)
		set str=
	)
)< %1 >> "%~d1%~p1%~n1_已处理%~x1"
goto :eof
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