title: shp to topojson conversion : no output
body: <p>Topojson's doc <a href="https://github.com/mbostock/topojson/wiki/Command-Line-Reference#input-and-output" rel="nofollow noreferrer">states</a>:</p>
  <p><em>You can specify ESRI shapefiles as input:</em></p>
  <pre><code>topojson -o output.json input.shp 
  </code></pre>
  <p>My <code>.shp</code> file is valid, <code>npm</code> and <code>topojson</code> are installed, and I'am in the input file's directory (<code>cd</code>). This <code>topojson</code> command simply doesn't work on my side, no output, nor feedback produced.</p>
  <p><strong>How do you convert <code>shp</code> into <code>topojson</code> on your side ?</strong></p>
  <hr />
  <p><code>which topojson</code> gives <code>/usr/local/bin/topojson</code></p>
  <p><code>which ogr2ogr</code> gives <code>/usr/bin/ogr2ogr</code></p>
  <p>On ubuntu 13.04, but I think my issue is not related to ubuntu.</p>