%SystemRoot% 와 %WINDIR% 변수 값의 차이는 ? 

copy "%SystemRoot%\system32\drivers\etc\hosts" "%USERPROFILE%\hosts.old"
vi %SystemRoot%\system32\drivers\etc\hosts
copy "%SystemRoot%\system32\drivers\etc\hosts" "%USERPROFILE%\hosts.last"


copy "%WINDIR%\system32\drivers\etc\hosts" "%USERPROFILE%\hosts.old"
vi %WINDIR%\system32\drivers\etc\hosts
copy "%WINDIR%\system32\drivers\etc\hosts" "%USERPROFILE%\hosts.last"
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