title: Sed: get lines beginning with some prefix
body: <p>I have file Blackberry jad file:</p>
  
  <pre><code>RIM-COD-URL-12: HelloWorld-12.cod
  RIM-COD-Size: 68020
  RIM-MIDlet-Icon-2-1: ____HOVER_ICON_res/icon/blackberry/icon-68.png,focused
  RIM-COD-URL-11: HelloWorld-11.cod
  RIM-MIDlet-Icon-Count-2: 1
  RIM-COD-URL-10: HelloWorld-10.cod
  RIM-MIDlet-Icon-Count-1: 1
  MIDlet-Vendor: Vasia Pupkin
  RIM-MIDlet-Icon-1-1: res\icon\blackberry\____HOVER_ICON_icon-68.png,focused
  Manifest-Version: 1.0
  RIM-MIDlet-Flags-1: 0
  RIM-COD-SHA1-38: 9a c8 b3 35 72 de 34 5e 7a 0a 5b 9e c3 3a 65 4c 20 0f 8e 50
  </code></pre>
  
  <p>I just want to get lines begin with <code>RIM-COD-</code>.</p>
  
  <p>Can you provide me solutions for <code>awk</code> or <code>sed</code>?</p>