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  1. or download this
    use strict;
use warnings;
...
close $sample_fh;
close $good_fh;
  2. or download this
    $ time perl test_demo.pl

...
user    0m43.956s
sys     0m0.452s
  3. or download this
    $ time /opt/perl-5.20.3/bin/perl test_demo.pl

...
user    1m20.164s
sys     0m8.488s