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#!/bin/env perl
use strict;
...
        my  @mx = mx($res, "example.com");
    }
} ;

for iterations in 1 2 3 4 5 6 7 8 9 10; do  perl  script.pl $iteration
+s 2>&1 | wc -l; done

1374
1492
...
2229
2353
2477