will get you a 2-day view on the next launch (btw, in 10.8 it's Calendar, not iCal), but if you change to a different view, there's no getting back to the 2-day view without quitting the app and running the Terminal command again.
Seems like there should be a hidden pref to make that view stick, though, doesn't it?
dkmarsh—member, FineTunedMac Co-op Board of Directors