Command line program - Check if run as superuser

[Fulgurance]

Good morning everyone. I am still working on my new package manager for Linux. In some case, I need to check if my command line program was run with privilege or not. How can I do that ?

[GeopJr]

if LibC.getuid == 0
	puts "superuser"
else
	puts "not superuser"
end

[Fulgurance]

@GeopJr

LibC.getuid

Thank you !

[Fulgurance]

I have another question about that. If my program try to access to a file it don’t have the proper right, how can I know that ?

[GeopJr]

Depends on your exact use-case but probably one of these:

• File.writable? & File.readable?
• File.info?, File::Info#permissions & File::Permissions

[hugopl]

@Fulgurance

I have another question about that. If my program try to access to a file it don’t have the proper right, how can I know that ?

An exception is thrown. Just rescue it.

[Fulgurance]

Why I didn’t think about that earlier