To install Ansys 13 silently together with setting the licence server info:
Setup.exe -silent -licserverinfo [Interconnect port]:[Flex port]:[servername]
To disable rss feeds use the -disablerss switch
You can create an options file which lists all of the products you want to install. This enables you to specify exactly what to install in a file rather than typing them into the command line. Save the file with .opt on the end and add this to the command line like this:
-productfile"[name of options file].opt"