Batch script: how to check for admin rights

Question

How do I check if the current batch script has admin rights?

I know how to make it call itself with runas but not how to check for admin rights. The only solutions I've seen are crude hack jobs or use external programs. Well, actually I don't care if it is a hack job as long as it works on Windows XP and newer.

Answer 1

You could do the following:

copy /b/y NUL %WINDIR%\06CF2EB6-94E6-4a60-91D8-AB945AE8CF38 >NUL 2>&1
if errorlevel 1 goto:nonadmin
del %WINDIR%\06CF2EB6-94E6-4a60-91D8-AB945AE8CF38 >NUL 2>&1
:admin
rem here you are administrator
goto:eof
:nonadmin
rem here you are not administrator
goto:eof

Note that 06CF2EB6-94E6-4a60-91D8-AB945AE8CF38 is a GUID that was generated today and it is assumed to be improbable to conflict with an existing filename.

Answer 2

>nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"&&(
 echo admin...
)