The RubyGems bookshelf
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gem Command Reference
This reference covers ‘gem’ version
0.8.7.
(Updating to 1.3.x in progress)
RubyGems Frequently Asked Questions
Frequently Asked Questions about the RubyGems Packaging System.
Gem::Specification Reference
The Gem::Specification object controls the data (and metadata) that goes into a GEM package. This reference defines the fields used in a Gem::Specification.
RubyGems User Guide
Everything you need to know about using the RubyGems packaging system.