title: What does command `sed -i "s/^ \+//g; s/ \+/\t/g"` mean?
body: <p>I'm new to <code>sed</code>. Can someone help me to explain following sed command?</p>
  
  <pre><code>sed -i "s/^ \+//g; s/ \+/\t/g"
  </code></pre>
  
  <p>I found the explanation for the <code>-i</code> option on Google, but no exact explanations for the above pattern meanings.</p>
  
  <p>Sorry that I don't have example file to show here due to the reason that our in-house server recently is under maintenance, which means I cannot access to the example file that needed here.</p>