title: How to delete some column based on the column headings of a csv file in R?
body: <ol>
  <li><p>I have loaded a csv file to R.</p></li>
  <li><p>There are 10 columns in the file.</p></li>
  <li><p>I want to save the 1st 3rd and 5th column to a new file.  What is the command line to delete other columns?</p></li>
  <li><p>I want to save the new table, what is the command line should be used?</p></li>
  </ol>