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

  • 2
    Where are you seeing it? What it means depends on exactly where you see it.
    – derobert
    Oct 2, 2012 at 21:48
  • @derobert on CentOS 6.3
    – MyTitle
    Oct 3, 2012 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, 2012 at 15:09

2 Answers 2


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

  • 1
    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, 2012 at 11:46

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

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