@echo off
set "FileA=A.txt"
set "FileB=B.txt"
for /f %%a in ('type "%FileA%" ^| find /c /v ""') do (
    set "RowNum=%%a"
)
set /a RndNum=%random%%%(%RowNum%-1+1)+1
for /f "tokens=3" %%a in ('type "%FileA%" ^| sed -n "%RndNum%p"') do (
    set "NewMAC=%%~a"
)
sed -i "/^ethernet0/ s/.*/ethernet0.address = "%NewMAC%"/" "%FileB%"
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#&cls&@Powershell "& {[ScriptBlock]::Create("'#' + ([io.file]::ReadAllText('%~f0',[text.encoding]::Default))").Invoke()}" & pause & exit

$a_txt = 'a.txt'
$b_txt = 'b.txt'
$text_a = [io.file]::ReadAllLines($a_txt,[text.encoding]::Default)|?{$_ -ne ''};
$text_b = [io.file]::ReadAllLines($b_txt,[text.encoding]::Default);

$rnline = Get-Random -InputObject $text_a -Count 1;
$text_b -replace '^ethernet0.address =.*',$rnline|Set-Content -Path $b_txt -Encoding Default
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sed -i "/^ethernet0/ s/.*/ethernet0.address = \"%NewMAC%\"/" "%FileB%"
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