$ perldoc -f qx
    "qx/STRING/"
            A string which is (possibly) interpolated and then executed as a
            system command with /bin/sh or its equivalent. Shell wildcards,
            pipes, and redirections will be honored. The collected standard
            output of the command is returned; standard error is unaffected.
            In scalar context, it comes back as a single (potentially
            multi-line) string, or "undef" if the command failed. In list
                                                                  ^^^^^^^
            context, returns a list of lines (however you've defined lines
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
            with $/ or $INPUT_RECORD_SEPARATOR), or an empty list if the
            command failed.