how do you start ruby 1.9 without rubygems

Question

I want my app to not be able to use any installed gems. Is there a ruby 1.9 startup parameter or way of doing this programmatically?

Answer 1

ruby --disable-gems

is the MRI (1.9) commandline parameter. "It prevents the addition of gem installation directories to the default load path". (The Ruby Programming Language, p. 391)

Edit 25-10-2012: Ruby core had the same idea as @rogerdpack in the comments and added the more verbose ruby --help parameter. Ruby revision!