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perl -nle"next if $.==1; $n[$_]=$_ }{ defined and print for @n" nums >
+nums2

#!perl -l
<>;
$n[ $_ ]=$_ while <>;
defined and print for @n;

[16:53:01.85] C:\test>1045728 nums >nums2
[16:53:03.44] C:\test>