@echo off & setlocal enabledelayedexpansion
set "file=%systemroot%\system32\drivers\etc\hosts"
for /f "tokens=2" %%i in ('more +11 "%~0"') do set #%%i=1
for /f "delims=" %%i in ('findstr /n .* %file%') do (
  set "s=%%i"
  set "s=!s:*:=!"
  for /f "tokens=1,2" %%j in ("#!s!") do if not defined #%%k echo;!s!
)
more +11 "%~0"
pause & exit

@echo off
if exist %temp%\$ del /q %temp%\$
for /f "delims=" %%i in (%systemroot%\system32\drivers\etc\hosts) do echo %%i>>%temp%\$
for /f "delims=" %%a in ('findstr /v /g:"%temp%\$" list.txt') do echo %%a>> %systemroot%\system32\drivers\etc\hosts