Gem関連

インストールできるバージョンの確認

gem list -ra rails

gemをバージョンダウンする

RubyGemsをバージョンダウンしたりバージョンアップしたり-アインシュタインの電話番号

gem list rubygems-update

*** LOCAL GEMS ***

rubygems-update (1.8.6)
# gem -v
1.8.6
# gem list rubygems-update -ra      

*** REMOTE GEMS ***

rubygems-update (1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0, 1.7.2, 1.7.1, 1.7.0, 1.6.2, 1.6.1, 1.6.0, 1.5.3, 1.5.2, 1.5.0, 1.4.2, 1.4.1, 1.4.0, 1.3.7, 1.3.6, 1.3.5, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0, 1.2.0, 1.1.1, 1.1.0, 1.0.1, 1.0.0, 0.9.5, 0.9.4, 0.9.3, 0.9.2, 0.9.1, 0.9.0, 0.8.11, 0.8.10, 0.8.8, 0.8.6, 0.8.5, 0.8.4, 0.8.3)
# gem uninstall -v 1.8.6 rubygems-update
Remove executables:
        update_rubygems

in addition to the gem? [Yn]  ERROR:  Interrupted
# gem install -v 1.6.2 rubygems-update
Fetching: rubygems-update-1.6.2.gem (100%)
Successfully installed rubygems-update-1.6.2
1 gem installed
Installing ri documentation for rubygems-update-1.6.2...
Installing RDoc documentation for rubygems-update-1.6.2...
# gem uninstall -v 1.8.6 rubygems-update
Successfully uninstalled rubygems-update-1.8.6
# update_rubygems 
RubyGems 1.6.2 installed

=== 1.6.2 / 2011-03-08

Bug Fixes:

* require of an activated gem could cause activation conflicts.  Fixes
  Bug #29056 by Dave Verwer.
* `gem outdated` now works with up-to-date prerelease gems.


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RubyGems installed the following executables:
        /usr/local/bin/gem