Shell script & csv problem to write in a file -

I try to add information to an ACV file with a shell script.

At this time I have information, my problem is that the CSV file is not empty at the beginning.

So I would like to put the new information in the second column.

But I can not find the way to do this.

Here's my code:

sed -i '1i column3' test.csv

sed -i '2i ;; 4 'test.csv

sed -i' 3i ;; 2 'test.csv

I have output

column 3

  4 2   
 1 2  
 3 4   
 And I like it:  
 
 1 2 column 3  
 3 4 4  
  2    
 Do you think this is possible?  
 Thanks   
 
 
 What you should do in your example:  
  sed -i '1s /.*/& amp; Column 3 / 'test.csv sed -i' 2s /.*/& amp; 4 / 'test.csv   
 with awk (just leave the "-vOFS =, -F," part if you want to use the space as a separator):    awk -vOFS =, -F, 'NR == 1 {$ 3 = "col3"; Print;} 'test.csv awk -vOFS =, -F,' NR == 2 {$ 3 = 4; Change the first column:  
  awk -vOFS =, -F, 'NR == 1 {$ 1 = "print;}' test.csv   
 Col1 "; Print;} 'test.csv   
 Enter a column between 2:  
  awk -vOFS =, -F,' NR == 1 { Print $ 1, "nucole", $ 2;} 'test.csv