ruby/rubygems · error · Gem::CommandLineError

Too many gem names (#{args.join(", ")}); please specify only

Error message

Too many gem names (#{args.join(", ")}); please specify only one

What it means

Error "Too many gem names (#{args.join(", ")}); please specify only one" thrown in ruby/rubygems.

Source

Thrown at lib/rubygems/command.rb:228

    else
      [name]
    end
  end

  ##
  # Get a single gem name from the command line.  Fail if there is no gem name
  # or if there is more than one gem name given.

  def get_one_gem_name
    args = options[:args]

    if args.nil? || args.empty?
      raise Gem::CommandLineError,
            "Please specify a gem name on the command line (e.g. gem build GEMNAME)"
    end

    if args.size > 1
      raise Gem::CommandLineError,
            "Too many gem names (#{args.join(", ")}); please specify only one"
    end

    args.first
  end

  ##
  # Get a single optional argument from the command line.  If more than one
  # argument is given, return only the first. Return nil if none are given.

  def get_one_optional_argument
    args = options[:args] || []
    args.first
  end

  ##
  # Override to provide details of the arguments a command takes.  It should
  # return a left-justified string, one argument per line.

View on GitHub (pinned to 86cbb817a3)

When it happens

Trigger: Thrown at lib/rubygems/command.rb:228 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ruby/rubygems@86cbb817a3 (2026-08-23). Data as JSON: /api/errors/68e0e8d5f9a276f9. Report an issue: GitHub.