title: How to modify configuration lines using shell scripting
body: <p>I have a <code>phppgadmin</code> configuration file (<code>/usr/share/phppgadmin/conf/config.inc.php</code>)
  It has a line:   </p>
  
  <pre><code>$conf['extra_login_security'] = false;
  </code></pre>
  
  <p>I would like to change it to:  </p>
  
  <pre><code>$conf['extra_login_security'] = true;
  </code></pre>
  
  <p>using <code>bash</code> shell-script. I understand that I would have to use something like sed/awk. But don't know how exactly to use it to do what I want.</p>