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

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Your problem is that you are passing a list to system and when system is passed a list it does not use the shell, but redirection (>/dev/null 2>&1) requires the shell so you have to put everything into a string: 

system "$config->{wkhtmltopdf_path} @options $source_file $config->{re
+sult_filename} >/dev/null 2>&1";

[download]

In reply to Re: Redirect output of the system() command by jwkrahn
in thread Redirect output of the system() command by Gangabass

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