Forums Scripts & Popups On Join Action For Specific Person

ok ive been trying to search google and trying to piece something together to do what im wanting but its not working. what im looking for is in a specific channel if a specific person enters i want an action to be done.

so like:
if (User) joins #(channel) /me (action)

this cant be even close but this is what im thinking of sort of.
on 1!:JOIN:#(channel):{
if $nick == User
/me (action)
}