Move pages under tldr, lint run.sh, update docs

tldr/rbenv

@@ -0,0 +1,42 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rbenv
+
+> Easily install Ruby versions and manage application environments.
+> See also: `asdf`.
+> More information: <https://github.com/rbenv/rbenv>.
+
+- Install a Ruby version:
+
+`rbenv install {{version}}`
+
+- Display a list of the latest stable versions for each Ruby:
+
+`rbenv install --list`
+
+- Display a list of installed Ruby versions:
+
+`rbenv versions`
+
+- Use a specific Ruby version across the whole system:
+
+`rbenv global {{version}}`
+
+- Use a specific Ruby version for an application/project directory:
+
+`rbenv local {{version}}`
+
+- Display the currently selected Ruby version:
+
+`rbenv version`
+
+- Uninstall a Ruby version:
+
+`rbenv uninstall {{version}}`
+
+- Display all Ruby versions that contain the specified executable:
+
+`rbenv whence {{executable}}`