yes Lua can help you for this:
the very first example in http://wiki.wireshark.org/Lua/Examples does it.
On Thu, Aug 28, 2008 at 10:56 AM, Zoran Bošnjak
<Zoran.Bosnjak@xxxxxxxxxxxxxxxxxx> wrote:
> How do I load "user specified decodes" table when starting wireshark?
> Tshark has "-d udp.port==<port>,<proto>" option. Is there any equivalent in wireshark?
> A lua script can be started automaticly... Does lua script have access to load this table?
>
> Zoran
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