title: move cursor to next line after input from filter command in vim
body: <p>In vim I filter, say the current single line, using !! through a Unix command. To achieve this I defined the following shortcut in .vimrc</p>
  
  <pre><code>:map &lt;Enter&gt;  !!mycommand&lt;CR&gt;:,+1&lt;CR&gt;
  </code></pre>
  
  <p>Pressing <code>&lt;Enter&gt;</code> this takes me to the line below the current if <code>mycommand</code> replaces my single input line be exactly one output line. If the output has more lines (number of lines unknown before command execution) it will still take me to the line below the current. 
  Now, I would like to know how I can always get to the first line below the inserted output of <code>mycommand</code>.</p>
  
  <p>The modified shortcut would then allow me to 'execute' the text file line by line using just <code>&lt;Enter&gt;</code> displaying the output each time.
  If there is no way to do this without any previous knowledge of the output of <code>mycommand</code>, maybe there is one knowing say the first character of each output line.</p>
  
  <p>Thanks a lot!</p>