By Robert Greiner on 18 Oct 2011.
I needed this over the weekend and the existing online help is less than helpful. As it turns out, just like with everything I try to do in Ruby, the solution is simple.
require 'tmpdir' temp = Dir.tmpdir() puts temp #C:/Users/Robert/AppData/Local/Temp
This is all built into Ruby, you don't need to install any gems or anything.