tldr/pages/common/gem.md

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#gem
> Interact with the package manager for the Ruby programming language.
- Install latest version of a gem
`gem install {{gemname}}`
- Install specific version of a gem
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`gem install -v={{0.0.15}}`
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- Update a gem
`gem update {{gemname}}`
- List all gems
`gem list`
- Uninstall a gem
`gem uninstall {{gemname}}`