title: preventing postgresql commands from keep asking for user password
body: <p>It's strange, but i've searched around for this source of configuration but couldnt find it out.</p>
  
  <p>Im currently using opensuse 11.3 with postgresql 9.</p>
  
  <p>Every postgresql command line that i issue will ask the current user password, like psql, createdb, dropdb, and i have to enter the password of the current user (which is postgres) to make it work.</p>
  
  <p>Doing <code>dropdb xxx &amp;&amp; createdb xxx</code> will ask the password twice.</p>
  
  <p>Please show me the light !</p>
  
  <p>Thank you :-)</p>
  
  <hr>
  
  <h2>EDIT</h2>
  
  <p>Actually im already running as a postgres user (a user in my linux), so i can psql without supplying the database password, but i still have to supply the password for the system user postgres. </p>
  
  <p>So if the database has a user of dbuser, and im running psql as the postgres (linux user), a password for the linux user (postgres) will be asked, not the dbuser password.</p>