Update cheatsheets

gem

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gem
+
+> A package manager for the Ruby programming language.
+> More information: <https://guides.rubygems.org>.
+
+- Search for remote gem(s) and show all available versions:
+
+`gem search {{regular_expression}} --all`
+
+- Install the latest version of a gem:
+
+`gem install {{gem_name}}`
+
+- Install a specific version of a gem:
+
+`gem install {{gem_name}} --version {{1.0.0}}`
+
+- Install the latest matching (SemVer) version of a gem:
+
+`gem install {{gem_name}} --version '~> {{1.0}}'`
+
+- Update a gem:
+
+`gem update {{gem_name}}`
+
+- List all local gems:
+
+`gem list`
+
+- Uninstall a gem:
+
+`gem uninstall {{gem_name}}`
+
+- Uninstall a specific version of a gem:
+
+`gem uninstall {{gem_name}} --version {{1.0.0}}`