title: What is the difference between ls -ls and ls -l?
body: <p>These are the commands I am trying. If i write </p>
  
  <pre><code>$ ls -ls
  </code></pre>
  
  <p>in Ubuntu terminal then it shows</p>
  
  <pre><code>4 -rw-r--r-- 1 27599 27599  978 Feb 13 18:25 README.txt   
  </code></pre>
  
  <p>If I write </p>
  
  <pre><code>$ ls -l
  </code></pre>
  
  <p>then it shows</p>
  
  <pre><code>-rw-r--r-- 1 27599 27599  978 Feb 13 18:25 README.txt
  </code></pre>
  
  <p>I am confused why the first command shows a digit number "4" but the 2nd does not. How it is happening?</p>