title: errors on shell
body: <p>somebody knows what does this error mean?</p>
  
  <pre><code>Usage: tcsh [ -bcdefilmnqstvVxX ] [ argument ... ].
  </code></pre>
  
  <p>I receive this error after I enter in my script this row </p>
  
  <pre><code>#! /bin/tcsh -f
  </code></pre>