Two ruby versions, need tidying up - ruby

Question

I seem to have multiple ruby / rubygem installations on my server.
The gem environment for each is:
root#weepingangel:~# gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 2.2.0
- RUBY VERSION: 2.1.0 (2013-12-25 patchlevel 0) [x86_64-linux]
- INSTALLATION DIRECTORY: /usr/local/rbenv/versions/2.1.0/lib/ruby/gems/2.1.0
- RUBY EXECUTABLE: /usr/local/rbenv/versions/2.1.0/bin/ruby
- EXECUTABLE DIRECTORY: /usr/local/rbenv/versions/2.1.0/bin
- SPEC CACHE DIRECTORY: /root/.gem/specs
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-linux
- GEM PATHS:
- /usr/local/rbenv/versions/2.1.0/lib/ruby/gems/2.1.0
- /root/.gem/ruby/2.1.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["http://gems.rubyforge.org", "http://gems.github.com"]
- "gem" => "--no-ri --no-rdoc"
- REMOTE SOURCES:
- http://gems.rubyforge.org
- http://gems.github.com
- SHELL PATH:
- /usr/local/rbenv/versions/2.1.0/bin
- /usr/local/rbenv/libexec
- /usr/local/rbenv/shims
- /usr/local/sbin
- /usr/local/bin
- /usr/sbin
- /usr/bin
- /sbin
- /bin
- /usr/games
root#weepingangel:~# sudo gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 1.8.11
- RUBY VERSION: 1.9.3 (2011-10-30 patchlevel 0) [x86_64-linux]
- INSTALLATION DIRECTORY: /var/lib/gems/1.9.1
- RUBY EXECUTABLE: /usr/bin/ruby1.9.1
- EXECUTABLE DIRECTORY: /usr/local/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-linux
- GEM PATHS:
- /var/lib/gems/1.9.1
- /root/.gem/ruby/1.9.1
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["http://gems.rubyforge.org", "http://gems.github.com"]
- "gem" => "--no-ri --no-rdoc"
- REMOTE SOURCES:
- http://gems.rubyforge.org
- http://gems.github.com
Does anyone know how I can clear these up as I only need one and I think I have things looking at my $PATH but it's pointing to the wrong one.

Answer 1

If you use rbenv you can run this in your profile to set the default ruby environment.
$rbenv global 2.2.0
Hope this helps.