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jr -v
jruby 1.4.0dev (ruby 1.8.7 patchlevel 174) (2009-09-26 1add48e) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_15) [x86_64-java]
enebo:12:15 ~/work/jruby_trunk 895% jr --1.9 -v
jruby 1.4.0dev (ruby 1.9.2dev trunk 24186) (2009-09-26 1add48e) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_15) [x86_64-java]
enebo:12:15 ~/work/jruby_trunk 896% /usr/local/bin/ruby -v
ruby 1.9.2dev (2009-07-18 trunk 24186) [i386-darwin9.8.0]
enebo:12:16 ~/work/jruby_trunk 897% ruby -v
ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-darwin9]