How can a program know whether it is running in superuser mode?

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I want to do something like this. 

if (program is not run in superuser mode) then 
 puts(1, "This program needs to be run in superuser mode.\n") 
 puts(1, "On Ubuntu, type 'sudo ' \n") 
end if

How can a Euphoria program running on Linux know whether it is running in superuser mode? There doesn't seem to be any way to solve this problem with command_line().

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