title: What's X-style geometry string?
body: <p>I want to use feh in linux to open an image at the specific location.
  I used "man feh" , just to find "feh -g " or "feh --geometry".
  However, the arguments needed to input is a x-style geometry string.</p>
  
  <p>the format is </p>
  
  <pre><code>feh -g width x height [ + x + y ]
  </code></pre>
  
  <p>I just copy the format from "man feh"
  x , y are the offsets which I need.
  But how to input this?
  Could you give me an example ?</p>