title: Replacing commas in a csv file with sed for mongoimport
body: <p>I have a <code>csv</code> file and I need to replace all the commas with dots. In other words, I need only the semicolon as a separator, and the commas need to be replaced with dots.
  I need this in order to import the data with <code>mongoimport</code>.
  I used the sed command, but it does not replace every occurrency of comma. For example:</p>
  
  <pre><code>Zolmitriptan;6 UNITA' 2,5 MG - USO ORALE;N02CC03;33345149;ZOMIG RAPIMELT;"""2,5 MG COMPRESSE ORODISPERSIBILI"" 6 COMPRESSE IN BLISTER";ASTRAZENECA S.P.A.;17,84;20,84;;3,00;FUB
  </code></pre>
  
  <p>becomes this , with <code>sed 's/\,/\./' &lt;filename&gt;</code>: </p>
  
  <pre><code>Zolmitriptan;6 UNITA' 2.5 MG - USO ORALE;N02CC03;33345149;ZOMIG RAPIMELT;"""2,5 MG COMPRESSE ORODISPERSIBILI"" 6 COMPRESSE IN BLISTER";ASTRAZENECA S.P.A.;17,84;20,84;;3,00;FUB
  </code></pre>
  
  <p>Notice that only the first comma was replaced. What am I doing wrong?</p>
  
  <p>PS. Is there a way to make mongoimport ignore the commas? (in this case I would not need the replacement)</p>