stephen,
try adding the user like you normally would.  Did you know the system users and 
database users are not necessarily the same person?  With that in mind, after adding 
the user, create an alias in .bashrc like 
alias psql='/usr/local/psql -U postgresadmin -d my_db_name'
Furthermore, in /home/username (that is, that user's ~ home directory) you can put a 
.pgpass file which contains the password for postgresadmin
HOWEVER, it would have been simpler to simply use the 'postgres' system account as it 
is the universal default

On Fri, Jul 02, 2004 at 07:56:09PM +0800, Stephen Liu wrote:
> Hi folks,
> 
> RH8.0
> postgresql-7.4.3.tar.gz
> 
> I have postgresql-7.4.3 installed
> 
> $ whereis pgsql
> pgsql: /usr/local/pgsql
> 
> and have created "postgresadmin" for root
> # adduser postgresadmin
> 
> root can su postgresadmin without password
> 
> Now I expect to add 'userA' to login as postgresadmin
> with a password
> 
> Can I perform following step to reach my goal;
> 
> # adduser userA postgresadmin passwd xxx
> 
> Kindly advise.  TIA
> 
> B.R
> Stephen
> 
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