ruby-on-rails – 在终端输入Rails命令,返回帮助

$rails server

我得到这个返回for和rails命令输入：

Usage:
  rails new APP_PATH [options]

Options:
  [--edge]                   # Setup the application with Gemfile pointing to Rails repository
  [--dev]                    # Setup the application with Gemfile pointing to your Rails checkout
  -G,[--skip-git]               # Skip Git ignores and keeps
  -m,[--template=TEMPLATE]      # Path to an application template (can be a filesystem path or URL)
  -b,[--builder=BUILDER]        # Path to a application builder (can be a filesystem path or URL)
      [--old-style-hash]         # Force using old style hash (:foo => 'bar') on Ruby >= 1.9
      [--skip-gemfile]           # Don't create a Gemfile
  -d,[--database=DATABASE]      # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)
                                 # Default: sqlite3
  -O,[--skip-active-record]     # Skip Active Record files
      [--skip-bundle]            # Don't run bundle install
  -T,[--skip-test-unit]         # Skip Test::Unit files
  -S,[--skip-sprockets]         # Skip Sprockets files
  -j,[--javascript=JAVASCRIPT]  # Preconfigure for selected JavaScript library
                                 # Default: jquery
  -J,[--skip-javascript]        # Skip JavaScript files
  -r,[--ruby=PATH]              # Path to the Ruby binary of your choice
                                 # Default: /usr/bin/ruby1.8

Runtime options:
  -s,[--skip]     # Skip files that already exist
  -f,[--force]    # Overwrite files that already exist
  -p,[--pretend]  # Run but do not make any changes
  -q,[--quiet]    # Supress status output

Rails options:
  -h,[--help]     # Show this help message and quit
  -v,[--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.

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.

为什么不启动服务器？对我来说,这似乎是一个rails helpDoc或其他一些.
类似的情况也发生在：

$rails generate

有什么办法可以让这些命令正确启动……

我在Ubuntu上使用Rails 3.1.3版.

顺便说一句：我是从myapp目录中输入的,即

chuckles@.......:~/Blog/new$

我确实通过运行来启动服务器：

$script/server

来自/新/