The most common rails commands are:
 generate     Generate new code (short-cut alias: "g")
 console      Start the Rails console (short-cut alias: "c")
 server       Start the Rails server (short-cut alias: "s")
 test         Run tests except system tests (short-cut alias: "t")
 test:system  Run system tests
 dbconsole    Start a console for the database specified in config/database.yml
              (short-cut alias: "db")
<% unless engine? -%>
 new          Create a new Rails application. "rails new my_app" creates a
              new application called MyApp in "./my_app"
 plugin new   Create a new Rails railtie or engine
<% end -%>

All commands can be run with -h (or --help) for more information.
In addition to those commands, there are: