[文本处理] 求助批处理批量给txt首行加入内容

@powershell "type '%~0'|select -skip 1|out-string|iex"&pause&exit
$f='指定文件名.txt'
foreach ($b in (dir -in $f -r)) {
$a=gc $b.fullname;
(echo 首行加入内容)>$b.fullname;
$a>>$b.fullname;
}
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@powershell "type '%~0'|select -skip 1|out-string|iex"&pause&exit
$f='指定文件名.txt'
$c='首行加入内容'
foreach ($b in (dir -in $f -r)) {
$a=gc $b.fullname;
$c,$a|out-file $b.fullname -Encoding utf8
}
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@echo off
chcp 65001 >nul
cd /d "%~dp0"
for /f "delims=" %%i in ('dir /b /s /a-d *.txt') do (
    echo 正在处理文件 "%%i"
    >"%%~ni.ttttt" echo 首行加入内容
    >>"%%~ni.ttttt" type "%%i"
    move /y "%%~ni.ttttt" "%%i" >nul
)
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