@echo off
set info=互助互利,支付宝扫码头像,感谢赞助
rem 有问题,可加QQ956535081及时沟通
title %info%
cd /d "%~dp0"
powershell -NoProfile -ExecutionPolicy bypass ^
    $n=1;^
    $str='444';^
    dir -r^|?{($_ -is [System.IO.FileInfo]) -and ($_.Extension -eq '.txt')}^|%%{^
        write-host $_.FullName;^
        $text=[IO.File]::ReadAllLines($_.FullName,[Text.Encoding]::Default);^
        if($text.Count -ge $n){^
            $text[$n-1]+=(\"`r`n\"+$str);^
            [IO.File]::WriteAllLines($_.FullName, $text, [Text.Encoding]::Default);^
        };^
    };^
    write-host '%info%' -ForegroundColor green;
pause
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@echo off

set /p "strInsert=Please input the insert content:"

for /f "tokens=*" %%i in ('dir /s/b/a-d *.txt') do (
	call :_Insert %%~si
)

pause
goto :EOF

:_Insert
(
	set /p=<nul>$.tmp
	echo,Current file : %1
	for /f "tokens=1,* delims=:" %%a in ('findstr /n .* %1') do (
		echo,%%b>>$.tmp
		if "%%a" equ "1" (
			echo,%strInsert%>>$.tmp
		)
	)
	type $.tmp
	move /y $.tmp %1
	echo,&echo,

	goto :EOF
)
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