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#!/usr/bin/perl
use warnings;
use strict;
...
  open STDIN, "<&", $stdin;
  exec "$^X", "tst.pl";
}

#!/usr/bin/perl
use warnings;
use strict;
...
  next unless /\[(\d+)\]/ && $1 % 2 == 1; # Only odds
  print "$1 is odd\n";
}