title: Using sed, how do you print the first 'N' characters of a line?
body: <p>Using <code>sed</code> what is an one liner to print the first <em>n characters</em>?  I am doing the following:</p>
  
  <pre><code>grep -G 'defn -test.*' OctaneFullTest.clj  | sed ....
  </code></pre>