[trevius]

I think it depends on exactly what you are trying to do. But, if you just want a player to cast a buff on themselves, this command should work:

quest::selfcast(spellid);

I haven't tested this, but if you want to change a target, maybe something like this would work:

my $cname = $client->GetCleanName();

my $get_client = $entity_list->GetClientByName($cname);

$client->SetTarget($get_client);