DEFAULT
Sets the default ruby version in all your shells (just for your user, not
system-wide)
rbenv global 1.9.2-p290
PROJECT
This sets the ruby version for the current directory. Typically used to set a
ruby version for a particular project.
rbenv local ree-1.8.7-2011.03
And then you might want to do...
git add .rbenv-version
git commit -m"specify the ruby version for this project"
TEMPORARY
You can also set the ruby version for a particular session. so maybe you want to
switch your ruby to a different version and then cd all over the place with wild
abandon while the ruby version stays the same:
rbenv shell jruby-1.6.4
INSTALL A RUNTIME
Install a ruby runtime (requires installing ruby-build first. easy and highly
recommended!)
rbenv install 1.9.3-p0
