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rails--rails/railties/lib/commands/runner.rb

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require 'optparse'
options = { :environment => (ENV['RAILS_ENV'] || "development").dup }
ARGV.options do |opts|
script_name = File.basename($0)
opts.banner = "Usage: runner 'puts Person.find(1).name' [options]"
opts.separator ""
opts.on("-e", "--environment=name", String,
"Specifies the environment for the runner to operate under (test/development/production).",
"Default: development") { |options[:environment]| }
opts.separator ""
opts.on("-h", "--help",
"Show this help message.") { puts opts; exit }
opts.parse!
end
ENV["RAILS_ENV"] = options[:environment]
RAILS_ENV.replace(options[:environment]) if defined?(RAILS_ENV)
require RAILS_ROOT + '/config/environment'
eval(ARGV.first)