Perhaps the following will help:

use strict;
use warnings;

my %seen;

while (<DATA>) {
    chomp;
    print "$_\n" unless $seen{$_}++;
}

__DATA__
30380868    N Sep 29               356200        AGEC682569   ATI     
+  S
30380868    N Sep 29               356200        AGEC682569   ATI     
+  S
71130740    N Sep  7               SM9481        AGEC683966   ATI     
+  S
71130740    N Sep  7               SM9481        AGEC683966   ATI     
+  S
32450045    N Jul 14               SN9672        AGEC685203   ATI     
+  S
32450045    N Jul 14               SN9672        AGEC685203   ATI     
+  S
36450223    N Aug 30               SU8329        AGEC685348   ATI     
+  S
34680135    N Sep 30               349450        AGEC685442   ATI     
+  S

[download]

Output:

30380868    N Sep 29               356200        AGEC682569   ATI     
+  S
71130740    N Sep  7               SM9481        AGEC683966   ATI     
+  S
32450045    N Jul 14               SN9672        AGEC685203   ATI     
+  S
36450223    N Aug 30               SU8329        AGEC685348   ATI     
+  S
34680135    N Sep 30               349450        AGEC685442   ATI     
+  S

[download]

I want to print the one with "**" as 2nd column and ignore the rest of duplicates..

Doesn't this raise the issue of the indistinguishability of identicals?

The script prints only unique records. chomp is used in case the last line of data above doesn't end with a newline.

In reply to Re: Selective printing of the Duplicates by Kenosis
in thread Selective printing of the Duplicates by Thomas Kennll

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