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test/
run1.log  run2.log  run3.log

test2/
run2.log  run2.log_1  run2.log_2

use warnings;
use strict;
...
        copy $base_file, "$to_dir/$file_name" or die $!;
    }
}

test2/
run1.log  run2.log  run2.log_1  run2.log_2  run2.log_3  run3.log

test2/
run1.log run1.log_1 run2.log  run2.log_1  run2.log_2  run2.log_3  run2
+.log_4  run3.log  run3.log_1