Something

on *:text:!greet*:#:{
  if ($1 == !greets) {
    set %greetz [ $+ [ $address($nick,2) ] ] $2-
    notice $nick Your greet for $address($nick,2) has been set to $2- $+ .
  }
}

on *:join:#:{
  msg $chan [ $nick ] %greetz [ $+ [ $address($nick,2) ] ]
}