Web Reference: Build a gem from a gemspec. The build command allows you to create a gem from a ruby gemspec. The best way to build a gem is to use a Rakefile and the Gem::PackageTask which ships with RubyGems. The gemspec can either be created by hand or extracted from an existing gem with gem spec: Ruby gems are the backbone of the Ruby ecosystem. Whether you are building a web application with Rails, writing a command-line tool, or automating infrastructure, you will rely on Ruby gems to avoid reinventing the wheel. This comprehensive guide covers everything you need to know about RubyGems — from installing your first gem to creating and publishing your own. Jul 23, 2025 · The gem command is a fundamental tool in Ruby for managing RubyGems, which are libraries or packages that extend the functionality of the Ruby programming language.
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