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use warnings;
use strict;
...
        print "$_\n";
    }
}

+=======+=======+============+============+============+
+-------+-------+------------+------------+------------+

+=======+=======+============+============+============+
line 1
line 2
+-------+-------+------------+------------+------------+

working on file a.txt
skipping a.txt
working on file b.txt
line 1
line 2