title: Delete all lines containing double forward slashes
body: <p>I have a sample text file like which contains lines like below:</p>
  
  <pre><code>/home0/abc/xyz/Example1.java:               //  log.error("error" , exception);
  /home0/abc/xyz/Example2.java:                   log.error("error" , exception);
  /home0/abc/xyz/Example3.java:               //  log.error("error" , exception);
  /home0/abc/xyz/Example4.java:                   log.error("error" , exception);
  </code></pre>
  
  <p>How can i delete all the lines containing double forward slashes (that is lines containing comments )in shell script.</p>
  
  <p>My final output should like below:</p>
  
  <pre><code>/home0/abc/xyz/Example2.java:                   log.error("error" , exception);
  /home0/abc/xyz/Example4.java:                   log.error("error" , exception);
  </code></pre>