title: Removing "/" symbol from a file shell
body: <p>I have this file</p>
  
  <pre><code>/sauga/pratybos/NAT.ppt
  /
  /sauga/pratybos/SNMP.ppt
  /
  /
  /
  /
  /
  /
  /
  /
  /favicon.ico
  /
  /
  /
  /
  /sauga/pratybos/NAT.ppt
  /
  /
  /os/chap07_files/slide0018.htm
  /
  /
  /
  /
  /
  /
  /
  /
  /
  /
  /sauga/pratybos/NAT.ppt
  /
  /
  /
  http://www.google.com/
  http://www.google.com/
  /
  /
  /
  /
  </code></pre>
  
  <p>And I want to remove  <code>/</code> only if there are no text 
  so my output should be</p>
  
  <pre><code>/sauga/pratybos/NAT.ppt
  /sauga/pratybos/SNMP.ppt
  /favicon.ico
  /sauga/pratybos/NAT.ppt
  /os/chap07_files/slide0018.htm
  /sauga/pratybos/NAT.ppt
  http://www.google.com/
  http://www.google.com/
  </code></pre>
  
  <p>I can easily be done like this</p>
  
  <pre><code>awk '{gsub("/", "");print}' 1a.txt &gt; a.txt
  </code></pre>
  
  <p>but then all <code>/</code> would be removed</p>
  
  <p>Is it possible to do that in shell?</p>