title: How to use PGPASSFILE environment variable?
body: <p>I am using <code>areca</code> backup program and I wrote a script in it to backup postgre database.
  I want to get password via <code>pgpass.conf</code> file but I can't give it's path to script.
  How can I use <code>PGPASSFILE</code> ?
  This is my script (; is separator) :</p>
  
  <pre><code>-U;postgres;-w;-F;custom;-b;-f;D:\satraAutoBackup\Daily\Saturday\postgresql\geoMolkBackup;geoMolkPortal2
  </code></pre>