Hello Guys, I need your help I have no idea where to start. I want to remove duplicate based on specific column and value. This file below. There are a lot of rows. 
    key_683,march,29031990,ABCD_FH,9,9
    key_684,march,29031990,ABCD_FH,9,9
    key_685,march,29031990,ABCD_FH,9,9
    key_686,march,29031990,ABCD_FH,9,9
    key_687,march,29031990,ABCD_FH,9,9
    key_688,march,29031990,ABCD_FH,9,9
    key_689,march,29031990,ABCD_FH,9,9
    key_693,march,29031990,ABCD_FH,9,9
    key_694,march,29031990,ABCD_FH,9,9
    key_683,march,29031990,ABCD_H + ABC_F,8,17
    key_684,march,29031990,ABCD_H + ABC_F,8,17
    key_685,march,29031990,ABCD_H + ABC_F,8,17
    key_686,march,29031990,ABCD_H + ABC_F,8,17
    key_687,march,29031990,ABCD_H + ABC_F,8,17
    key_688,march,29031990,ABCD_H + ABC_F,8,17
    key_689,march,29031990,ABCD_H + ABC_F,8,17
    key_690,march,29031990,ABCD_H + ABC_F,8,17
    key_691,march,29031990,ABCD_H + ABC_F,8,17
    key_692,march,29031990,ABCD_H + ABC_F,8,17
    key_693,march,29031990,ABCD_H + ABC_F,8,17
    key_694,march,29031990,ABCD_H + ABC_F,8,17
    key_695,march,29031990,ABCD_H + ABC_F,8,17
    key_696,march,29031990,ABCD_H + ABC_F,8,17
    key_697,march,29031990,ABCD_H + ABC_F,8,17
    key_698,march,29031990,ABCD_H + ABC_F,8,17
    key_699,march,29031990,ABCD_H + ABC_F,8,17
    key_683,march,29031990,ABC_H + AB_F,2,19
    key_684,march,29031990,ABC_H + AB_F,2,19
    key_685,march,29031990,ABC_H + AB_F,2,19
    key_686,march,29031990,ABC_H + AB_F,2,19
    key_687,march,29031990,ABC_H + AB_F,2,19
    key_688,march,29031990,ABC_H + AB_F,2,19
    key_689,march,29031990,ABC_H + AB_F,2,19
    key_690,march,29031990,ABC_H + AB_F,2,19
    key_691,march,29031990,ABC_H + AB_F,2,19
    key_692,march,29031990,ABC_H + AB_F,2,19
    key_693,march,29031990,ABC_H + AB_F,2,19
    key_694,march,29031990,ABC_H + AB_F,2,19
    key_695,march,29031990,ABC_H + AB_F,2,19
    key_696,march,29031990,ABC_H + AB_F,2,19
    key_697,march,29031990,ABC_H + AB_F,2,19
    key_698,march,29031990,ABC_H + AB_F,2,19
    key_699,march,29031990,ABC_H + AB_F,2,19
    key_700,march,29031990,ABC_H + AB_F,2,19
    key_701,march,29031990,ABC_H + AB_F,2,19

[download]
The column 0 there is a unique key and I have groups of keys. I need to print the difference between them. For example my group 1 is ABCD_FH. So I want to print 9 positions of group ABCD_FH and reserved them. key_683 up to key_694. 
    key_683,march,ABCD_FH,9,9
    key_684,march,ABCD_FH,9,9
    key_685,march,ABCD_FH,9,9
    key_686,march,ABCD_FH,9,9
    key_687,march,ABCD_FH,9,9
    key_688,march,ABCD_FH,9,9
    key_689,march,ABCD_FH,9,9
    key_693,march,ABCD_FH,9,9
    key_694,march,ABCD_FH,9,9

[download]
Now is the magic, the group 1 I will use the keys I have reserved and print the leftovers from group 2 - ABCD_H + ABC_F and printing 
    key_690,march,ABCD_H + ABC_F,8,17
    key_691,march,ABCD_H + ABC_F,8,17
    key_692,march,ABCD_H + ABC_F,8,17
    key_695,march,ABCD_H + ABC_F,8,17
    key_696,march,ABCD_H + ABC_F,8,17
    key_697,march,ABCD_H + ABC_F,8,17
    key_698,march,ABCD_H + ABC_F,8,17
    key_699,march,ABCD_H + ABC_F,8,17

[download]
And the group 3 the leftovers from group 1 and group 2, 
    key_700,march,ABC_H + AB_F,2,19
    key_701,march,ABC_H + AB_F,2,19

[download]
So my final file will be. 
    key_683,march,ABCD_FH,9,9
    key_684,march,ABCD_FH,9,9
    key_685,march,ABCD_FH,9,9
    key_686,march,ABCD_FH,9,9
    key_687,march,ABCD_FH,9,9
    key_688,march,ABCD_FH,9,9
    key_689,march,ABCD_FH,9,9
    key_693,march,ABCD_FH,9,9
    key_694,march,ABCD_FH,9,9
    key_690,march,ABCD_H + ABC_F,8,17
    key_691,march,ABCD_H + ABC_F,8,17
    key_692,march,ABCD_H + ABC_F,8,17
    key_695,march,ABCD_H + ABC_F,8,17
    key_696,march,ABCD_H + ABC_F,8,17
    key_697,march,ABCD_H + ABC_F,8,17
    key_698,march,ABCD_H + ABC_F,8,17
    key_699,march,ABCD_H + ABC_F,8,17
    key_700,march,ABC_H + AB_F,2,19
    key_701,march,ABC_H + AB_F,2,19

[download]

In reply to I want to remove duplicate based on specific column and value. by EBK

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