To install JRuby:
$ wget http://jruby.kenai.com/downloads/1.4.0/jruby-bin-1.4.0.zip $ unzip jruby-bin-1.4.0.zip $ mv jruby-1.4.0 /opt/ $ cd /opt $ ln -s jruby-1.4.0 jruby
To verify:
$ /opt/jruby/bin/jruby -v
To optionally add JRuby to the system path:
$ edit /etc/profile # add these lines export PATH=$PATH:/opt/jruby/bin export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/jruby/lib