title: How to interactively set syntax highlighting in VI editor
body: <p>Using vi, I want to display files in distinguished colors in unix.  If I save a file as <code>.sql</code> or <code>.java</code> it will highlight the keywords.  I want to make changes to which words are highlighted, and in what color.</p>
  
  <p>How do I control syntax highlighting and color schemes with various vi file extensions?</p>