rails 3.0.5 3.0.4 が混在している環境で、
新しいプロジェクトを作成する必要が出来てきたので、
rails new hoge
を実行したところ、
Usage:
rails new APP_PATH [options]
Options:
-r, [--ruby=PATH] # Path to the Ruby binary of your choice
# Default: C:/Ruby192/bin/ruby.exe
-d, [--database=DATABASE] # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db)
# Default: sqlite3
-b, [--builder=BUILDER] # Path to an application builder (can be a filesystem path or URL)
-m, [--template=TEMPLATE] # Path to an application template (can be a filesystem path or URL)
[--dev] # Setup the application with Gemfile pointing to your Rails checkout
[--edge] # Setup the application with Gemfile pointing to Rails repository
[--skip-gemfile] # Don't create a Gemfile
-O, [--skip-active-record] # Skip Active Record files
-T, [--skip-test-unit] # Skip Test::Unit files
-J, [--skip-prototype] # Skip Prototype files
-G, [--skip-git] # Skip Git ignores and keeps
Runtime options:
-f, [--force] # Overwrite files that already exist
-p, [--pretend] # Run but do not make any changes
-q, [--quiet] # Supress status output
-s, [--skip] # Skip files that already exist
Rails options:
-v, [--version] # Show Rails version number and quit
-h, [--help] # Show this help message 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.
上記が表示されて作れなくなってた！
なんじゃこりゃと思って、ぐぐってたら、
gemのシステムバージョンをあげてみろと。
gem update --system
上記実行後、再度コマンドを打つと作成できました。
参考：http://pastebin.com/HMuUqRKs