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my @options = qw(
    
...
);

system( $config->{wkhtmltopdf_path}, @options, $source_file, $config->
+{result_filename}, ">/dev/null", "2>&1" );

system("( /usr/bin/wkhtmltopdf www.google.com Result.pdf )", ">/dev/nu
+ll", "2>&1");