title: Linux. How to cut line
body: <p>I have a problem to split line. 
  I have input.         </p>
  
  <pre><code>echo dat1 dat2 dat3 | tr " " "\n" | xargs -I {} -p ln -s {}
  </code></pre>
  
  <p>I need to get command from line. Output must be:  </p>
  
  <pre><code>echo    
  tr     
  xargs
  </code></pre>
  
  <p>I can't use a command awk. </p>