title: vimrc help : trying to map Ctrl-s to :w
body: <p>My current .vimrc file is</p>
  
  <pre><code>syntax on
  colorscheme zellner
  set nu
  set ruler
  set si "Smart indet
  map &lt;C-s&gt; :w&lt;cr&gt;
  </code></pre>
  
  <p>I thought the last line would allow me to hit control-s to automatically save while in normal mode?</p>
  
  <p>{
  The last line is just the trim downed version of what I really want which is</p>
  
  <pre><code>map &lt;C-s&gt; &lt;esc&gt;:w&lt;cr&gt;a
  </code></pre>
  
  <p>}</p>
  
  <p>Am I forgetting something?</p>
  
  <p>I'm using vim 7.3 that came with my mac.</p>