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.rb

Use caution

Ruby source code

Source for Ruby, Yukihiro Matsumoto's dynamic scripting language. Rails brought it into the web-development mainstream.

MIME types

  • text/x-ruby
  • application/x-ruby

Category

code

What opens this file

  • ruby CLI
  • VS Code + Ruby LSP
  • RubyMine

How to open by OS

Windows

  • RubyInstaller, or WSL + rbenv.

Mac

  • Homebrew, rbenv, or asdf.

Linux

  • Distribution Ruby or rbenv.

Ios

  • None.

Android

  • rbenv via Termux.

Safety notes

  • eval, Kernel#load, and Marshal.load all execute arbitrary code. Never run them on external input.
  • Older Rails versions carry extensive CVE history — keep majors current.

Common mistakes

  • Not committing Gemfile.lock leads to version drift across environments.
  • Skipping nil checks yields NoMethodError floods. Use &. and ActiveSupport's presence where available.

Related extensions

References