You mean something like this?

while(<>){
    chomp;
    if(/(ID=.+)$/){
        if(++$ids{$1} > 1){ 
            say $_, $ids{$1};
            next;
        }        
    }
    say;    
}

[download]

Try and get yourself a copy of the Perl Cookbook. It usually comes handy for such tasks.

In reply to Re: rename duplicate data by monsoon
in thread rename duplicate data by blacknight

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