How to make JRuby 1.6 default to Ruby 1.9?

Use the JRUBY_OPTS environment variable. JRUBY_OPTS holds a list of arguments that are added to any arguments specified on the command line. For example (on Linux): $ jruby -v jruby 1.6.0.RC1 (ruby 1.8.7 patchlevel 330) (2011-01-10 769f847) (Java HotSp… $ export JRUBY_OPTS=–1.9 $ jruby -v jruby 1.6.0.RC1 (ruby 1.9.2 trunk 136) (2011-01-10 769f847) (Java HotSpot(TM… … Read more