Would it be as simple as just running the one shell, and that shell makes all 4 copies of the app?
Yep, the code that MultiMacBox23 posted is one shell script that just makes all four copies.

is there a better format to save the file in originally, something like .html or the like (if converting it doesn't work)?
I believe after you do the Format->Make Plain Text thing, TextEdit gets less picky about the file extension and lets you save it as a .sh file outright.

I was only concerned about the launcher script because I have upgraded one of my accounts (my main) to battle.net, while the others are still standard blizzard accounts. Will that make any difference?
I think you should be okay without the Launcher in your copies.

For me, it was a while ago, immediately after switched my accounts over to Battle.net I couldn't log in using the regular "World of Warcraft.app" and kept getting an error when I tried. So, I ditto-ed the Launcher and logged in that way, which worked. However, after that I never had to use the Launcher again and have gone back to just using "World of Warcraft.app". Just keep it in mind as a possible future trick if you merge your other accounts and have trouble logging in afterwards.


Sorry, I don't really have any advice to offer on the programming question. I'm really more of an OS/system-level programmer and don't really mess around much with real apps.