How to upgrade/downgrade Rubygems:

How to upgrade/downgrade Rubygems:

For RubyGems 1.5.0 and 1.5.1:

RubyGems 1.5.0和1.5.1版本中包含了一个故障的gem update --system命令，请参考下方提供的手动升级食谱。

On Ruby 1.9.x:

From stock ruby shipping with 1.9:

Use the Normal Upgrade Method below. (finally!)

On Ruby 1.8.x:

From rubygems 1.3.x:

Use the Normal Upgrade Recipe below.

From rubygems 1-1.x through 1.2.x:

RubyGems 1.1 和 1.2 版本在未安装 rubygems-update 的情况下升级会遇到困难。当遇到 "Nothing to update" 提示时，请按照以下步骤操作。

Use the Manual Upgrade Recipe below.

From rubygems < 1.1.x:

Use the Normal Upgrade Recipe below.

Downgrade Recipe

Normal Downgrade

With rubygems 1.5.2 and higher:

With rubygems 1.5.1 and lower:

Use sudo/su as appropriate:

Replace 1.3.7 with any version you choose to downgrade to. This recipe can also be used to upgrade to a particular version rather than the most recent one.

Do ensure that you don't have any other installations of rubygems-update installed when running the second command.

1.9.2 Downgrade from Rubygems 1.4.x+ to stock 1.9 rubygems:

Use sudo/su as appropriate:

Upgrade Recipes

Normal Upgrade

Use sudo/su as appropriate:

Manual Upgrade

If an older version of RubyGems is installed on your system, then you can still accomplish the task in two steps.

Use sudo/su as appropriate:

Manual Install

Unless you have no RubyGems installed, the pre gem installation method still exists, which can be done manually.

Use sudo/su as appropriate:

获取下载地址

Unpack into a directory and cd there

Install with: ruby setup.rb