title: How to append/update the data in particular column using shell scripting
body: <p>I have a file in which it contain nearly 20 column. 
  I need to update the 7th column , in which i need to add 8 zero's to it </p>
  
  <p>eg : tmp.txt</p>
  
  <pre><code>756 S#017925 5608 R88 X3GU0C LIC 200 00000000000 
  756 S#017925 5608 R88 M3GURA LIC 200 00000000000 
  </code></pre>
  
  <p>The 7th column(bolder one) i need to append 8 zeros to it i.e "00000000200" .</p>
  
  <p>expected output :</p>
  
  <pre><code>  756 S#017925 5608 R88 X3GU0C LIC 00000000200 00000000000 
  </code></pre>
  
  <p>I tried using awk command</p>
  
  <pre><code>awk -F' ' '{print "00000000"$7}' tmp.txt &gt; tmp1.txt
  </code></pre>
  
  <p>but it is returning like :</p>
  
  <pre><code>00000000200
  00000000200
  </code></pre>