Use hash and save each line with the second field as key of each record. So you will get the latest record if the key get duplicated.
my %hash ;
my @arr = split(/\s+/, $_);
print Dumper \%hash;
1/2/2013 cgoo nreuiheru
1/4/2013 doow reiqrqueih
1/5/2013 hellio ruieqrhfuepqh
1/20/2013 cgoo 3rhquh4ureyh
1/30/2013 yetil jerqohgqrij
2/13/2013 hellio rueqipheruh
2/14/2013 cgoo wehrig4r74378
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