title: Adding extension to multiple files in linux commandline
body: <p>I have multiple files in my directory that start with split4_, I want to add a .csv extension to all these files.</p>
  
  <p>I am trying the following command.</p>
  
  <pre><code>mv split4_* *.csv
  </code></pre>
  
  <p>It doesn't work. What am I missing?</p>