title: How to get icon from current system theme in bash script (ubuntu)?
body: <p>In Ubuntu 14.10, I would like to display a notification with an icon from the current system theme.  In the following code, line 3 is an example of what I mean:  </p>
  
  <pre><code>1  #!/bin/bash
  2  # Display a notification with an icon
  3  ICON="$(somehow-get-path-to-system-theme-root-dir)/rest/of/path/to/icon.svg"
  4  notify-send -i $ICON "Some notification text"
  </code></pre>
  
  <p>Does such a command exist, and if so, what is it?</p>