Question

Rspec book says to run cucumber features -n command. But it is giving following error

missing argument: -n (OptionParser::MissingArgument)
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-    1.2.1/lib/cucumber/cli/options.rb:119:in `parse!'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/lib/cucumber/cli/configuration.rb:25:in `parse!'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/lib/cucumber/cli/main.rb:55:in `configuration'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/lib/cucumber/cli/main.rb:63:in `run_drb_client'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/lib/cucumber/cli/main.rb:34:in `execute!'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/lib/cucumber/cli/main.rb:20:in `execute'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/gems/cucumber-1.2.1/bin/cucumber:14:in `<top (required)>'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/bin/cucumber:19:in `load'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/bin/cucumber:19:in `<main>'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/bin/ruby_noexec_wrapper:14:in `eval'
/Users/pajama/.rvm/gems/ruby-1.9.2-p320/bin/ruby_noexec_wrapper:14:in `<main>'

Answer 1

from the cucumber source:

opts.on("-n NAME", "--name NAME",
        "Only execute the feature elements which match part of the given name.",
        "If this option is given more than once, it will match against all the",
        "given names.")

so you would need to call -n name_of_the_feature