System admin

Is there a good guise for system admin?  I am stumped on the most
mundane problem right now: how do I set user passwords in postgresql?
When I createuser I never get prompted for a password, when I run psql
with no parameters I get right in, but if I run:
 "psql -u someone"
I get a password prompt - also perl/DBI looks like it wants a password.
--
John Guthrie

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