What does root:wheel mean in the following?

chown root:wheel myfile


root is a user (the super user) and wheel is a group (of super users I guess).

chown root:wheel myfile

means making myfile belong to the user root and the group wheel (read man chown for more information).

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More specifically about the wheel group:It is a Unix group specifically intended for only those users who have rights to su as root.

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