To flesh out AnonyMonk's reply, maintain a hash of items inserted and add a little logic to your double-click call-back.

...
my %inserted = map { $_ => 0 } @list;
...
        $txt_scroll->insert( 'end', "SELECTED IP : $current_ip\n" )
           unless $inserted{ $current_ip } ++;
...

[download]

I hope this is helpful.

Cheers,

JohnGG

In reply to Re: How to avoid the duplicate selection in perl tk by johngg
in thread How to avoid the duplicate selection in perl tk by vr786

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