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The question is in the title. What does the number 0 signify?

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Where are you seeing it? What it means depends on exactly where you see it. – derobert Oct 2 '12 at 21:48
@derobert on CentOS 6.3 – MyTitle Oct 3 '12 at 7:08
In the output of what command are you seeing it? Or as the argument to which? E.g., my ls -l prints permissions symbolically, and doesn't print 0. But its also not really a "list", so I'm at a loss as to where you're seeing this. – derobert Oct 3 '12 at 15:09

That it belongs to user/group with ID 0. That would be root (see /etc/passwd and /etc/group).

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Note that on some systems (most notably the *BSDs) the group with the numerical id 0 is called wheel, not root. – D_Bye Oct 2 '12 at 11:46

0=no rights for owner/group (quite unusual).

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