[expert] postgresql

[Collins Richey]

Does anyone know how to get started with this?  

The postgresql server and postmaster are started, but I can't add users 
or do anything useful.  Either from root or my normal user, createuser, 
for example, reports that the slected user is not in something called 
'pg_shadow'.  The admin guide doesn't mention anything about this.

Any clues?

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Thanks,
Collins Richey
Denver area