Job Advancement idea

Ok it's never been seen before but I think that a @jobadvance (example) Fire Poison Mage command would be amazing I don't know if coding could do it and I'm researching this right now and hoping I could get back to this thread with what I found if it's something simple I could post how to implement it. This is only a suggestion don't take it like I will find out how to do it.

Edit: I have found 2 tuts that are very useful still finding on how to create the command but I have learnt how to change the files on the /server folder and also learnt how to block it from certain users like;
Cyngus Knights lvl0 over cannot job advance to Aran5

Edit2: Impossible to code this without further research but I have found the closest thing please make a @jobadvance command to link to the job advancer
} else if (splitted[0].equals("@Jobadvance")) {
NPCScriptManager npc = NPCScriptManager.getInstance();
npc.start(c, NPC ID);