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 This is not what you want to use to capture the output from a command
+; for that you should use merely backticks or qx//, as described in `
+STRING` in perlop.

#!usr/bin/perl
use say;
...
-rw-r--r-- 1 tinyos tinyos   459 Jun 28 00:04 example.fa
-rw-r--r-- 1 tinyos tinyos   458 Jun 28 00:04 example.fa~
-rw-r--r-- 1 tinyos tinyos 10739 Jun 28 00:30 results.txt