$ rvm use system
ruby 1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]
$ rvm gemset list_all
gemsets for ruby-1.8.7-p374 (found in /home/username/.rvm/gems/ruby-1.8.7-p374)
=> (default)
global
gemsets for ruby-2.0.0-p247 (found in /home/username/.rvm/gems/ruby-2.0.0-p247)
=> (default)
global
gemsets for ruby-1.9.3-p448 (found in /home/username/.rvm/gems/ruby-1.9.3-p448)
=> (default)
global
$ rvm gemdir 1.8.7
$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.8.17
- RUBY VERSION: 2.0.0 (2013-06-27 patchlevel 247) [x86_64-linux]
- INSTALLATION DIRECTORY: /home/username/.rvm/gems/ruby-2.0.0-p247
- RUBY EXECUTABLE: /home/username/.rvm/rubies/ruby-2.0.0-p247/bin/ruby
- EXECUTABLE DIRECTORY: /home/username/.rvm/gems/ruby-2.0.0-p247/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-linux
- GEM PATHS:
- /home/username/.rvm/gems/ruby-2.0.0-p247
- /home/username/.rvm/gems/ruby-2.0.0-p247@global
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://rubygems.org/
运行 rvm gemdir 1.8.7
结果还是 /home/username/.rvm/gems/ruby-2.0.0-p247
,怎么换到 ruby-1.8.7-p374
?