“using Zsh, cannot show progress, be patient…”

That sounds like a bad excuse, and almost as bad as “oh, we just need your sudo(8) password”.

ruby-1.9.3-p448 - #downloading ruby-1.9.3-p448, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 9816k  100 9816k    0     0  87194      0  0:01:55  0:01:55 --:--:--  103k
ruby-1.9.3-p448 - #extracting ruby-1.9.3-p448 to /Users/jashank/.rvm/src/ruby-1.9.3-p448 - using Zsh, can not show progress, be patient...
ruby-1.9.3-p448 - #extracted to /Users/jashank/.rvm/src/ruby-1.9.3-p448
ruby-1.9.3-p448 - #configuring - using Zsh, can not show progress, be patient...
  10.63s user 10.37s system 16% cpu 2:05.78 total
ruby-1.9.3-p448 - #compiling - using Zsh, can not show progress, be patient...

I almost expect the next line to be

ruby-1.9.3-p448 - #removing / - using Zsh, can not show progress, be patient...