awk - Check which string in certain column is repeated -

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I have to see that the string has to be repeated in my column 2.

For example: An apple b peach C grapes D peach e peach F. apple

My output will be: 

  An apple f apple peach d peach e peach   
 Showing the entire line on the second row with the normal string.   
 
 
 If you do not want to store all the files in memory, the best part is that the file Have to read twice  
  $ awk 'FNR == NR {a [$ 2] ++;              
  •  To print the other lines, in which the second column is counted at least twice.   
     As you reproduce the exact output you received, just pipe it on  sort  indicates that it was first column 2 and then column Sort by 1:  
      awk 'FNR == nr {a [$ 2] ++; Next} one [$ 2] & gt; 1 file file | Sort -2.2-K1    

     




  
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