title: Combine multiple data files in a single plot
body: <p>I have several data files produced from a Fortran code. All the data files are following the same style regarding their names, that is: data###.out, where ### starts from 001 and ends to 500. I know that in order to read and plot several data files in <code>gnuplot</code> I must use </p>
  
  <pre><code>plot for [i=1:500] sprintf('data00%i.out', i) u 1:2 w d lc rgb 'black'
  </code></pre>
  
  <p>However, this only works until data009.out. For 010 to 099 it should skip one zero and from 100 to 999 two zeros. How can I obtain this?</p>