bin/rails about

Railsアプリケーションの情報を表示する。bin/rails aboutを実行すると以下のような内容を出力する。

About your application's environment
Rails version             6.1.3
Ruby version              ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
RubyGems version          3.1.4
Rack version              2.2.3
Middleware                Webpacker::DevServerProxy, Rack::MiniProfiler, ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, ActiveSupport::Cache::Strategy::LocalCache::Middleware, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Sprockets::Rails::QuietAssets, Rails::Rack::Logger, ActionDispatch::ShowExceptions, WebConsole::Middleware, ActionDispatch::DebugExceptions, BetterErrors::Middleware, ActionDispatch::ActionableExceptions, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::Migration::CheckPending, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, ActionDispatch::PermissionsPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper, Bullet::Rack
Application root          /app
Environment               development
Database adapter          sqlite3
Database schema version   0