title: How can we show all the databases in a cluster without using `psql`'s command or option?
body: <p><a href="https://stackoverflow.com/a/771880/156458">https://stackoverflow.com/a/771880/156458</a> provides a way to show all the tables defined in a database, via information schema. Since information schema is per database, I guess it won't be useful for showing all the databases in a cluster?  </p>
  
  <p>How would you show all the databases in a cluster in a comparable way, i.e. without using <code>psql</code>'s command or option?</p>
  
  <p>Thanks.</p>