title: create database in postgresql with bash command
body: <p>Im trying to create a database in postgresql using linux.<br>
  I connected to postgres with  </p>
  
  <pre><code>sudo -u postgres psql postgres 
  postgres=# then i tried **CREATE DATABASE demo** or **createdb demo**
  </code></pre>
  
  <p>but none of them worked when i checked with <strong>\l</strong> command.<br>
  Any help ?</p>