环境：Mac OS X 10.9.5
--- rails_projects/first_app » rvm -v
rvm 1.26.4 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
--- rails_projects/first_app » ruby -v
ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin13.0]
--- rails_projects/first_app » gem -v
2.4.5
--- rails_projects/first_app » rails -v
Rails 3.2.13
--- rails_projects/first_app » node -v
v0.10.32
项目文件都已经顺利生成好了，这是第一个helloworld，貌似也没报错呀，但也没启动服务，新手就教了
---rails_projects/first_app » rails server
Usage:
rails new APP_PATH [options]
Options:
-r, [--ruby=PATH] # Path to the Ruby binary of your choice
# Default: /Users/HuangKai/.rvm/rubies/ruby-2.1.5/bin/ruby
-b, [--builder=BUILDER] # Path to a application builder (can be a filesystem path or URL)
-m, [--template=TEMPLATE] # Path to an application template (can be a filesystem path or URL)
[--skip-gemfile], [--no-skip-gemfile] # Don't create a Gemfile
[--skip-bundle], [--no-skip-bundle] # Don't run bundle install
-G, [--skip-git], [--no-skip-git] # Skip Git ignores and keeps
-O, [--skip-active-record], [--no-skip-active-record] # Skip Active Record files
-S, [--skip-sprockets], [--no-skip-sprockets] # Skip Sprockets files
-d, [--database=DATABASE] # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
# Default: sqlite3
-j, [--javascript=JAVASCRIPT] # Preconfigure for selected JavaScript library
# Default: jquery
-J, [--skip-javascript], [--no-skip-javascript] # Skip JavaScript files
[--dev], [--no-dev] # Setup the application with Gemfile pointing to your Rails checkout
[--edge], [--no-edge] # Setup the application with Gemfile pointing to Rails repository
-T, [--skip-test-unit], [--no-skip-test-unit] # Skip Test::Unit files
[--old-style-hash], [--no-old-style-hash] # Force using old style hash (:foo => 'bar') on Ruby >= 1.9
Runtime options:
-f, [--force] # Overwrite files that already exist
-p, [--pretend], [--no-pretend] # Run but do not make any changes
-q, [--quiet], [--no-quiet] # Suppress status output
-s, [--skip], [--no-skip] # Skip files that already exist
Rails options:
-h, [--help], [--no-help] # Show this help message and quit
-v, [--version], [--no-version] # Show Rails version number and quit
Description:
The 'rails new' command creates a new Rails application with a default
directory structure and configuration at the path you specify.
You can specify extra command-line arguments to be used every time
'rails new' runs in the .railsrc configuration file in your home directory.
Note that the arguments specified in the .railsrc file don't affect the
defaults values shown above in this help message.
Example:
rails new ~/Code/Ruby/weblog
This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
See the README in the newly created application to get going.
---rails_projects/first_app »
找到原因了，参考这篇帖子，都是Rails版本不对导致的