It can't be all numbers, right?

On the contrary (for unix-like systems, at least), the uid and gid are always numeric. To get the name (string) associated with a given numeric gid value, you need to grep for that number in /etc/groups (and to get the user login name for a given uid, you look up the uid in /etc/passwd).

In reply to Re^3: How to get group ownership of a file by graff
in thread How to get group ownership of a file by Anonymous Monk

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