deivid-rodriguez/byebug · error · Byebug::CommandNotFound

Unknown command '#{name}'. Try '#{help}'

Error message

Unknown command '#{name}'. Try '#{help}'

What it means

Error "Unknown command '#{name}'. Try '#{help}'" thrown in deivid-rodriguez/byebug.

Source

Thrown at lib/byebug/subcommands.rb:28

  # Subcommand additions.
  #
  module Subcommands
    def self.included(command)
      command.extend(ClassMethods)
    end

    extend Forwardable
    def_delegators "self.class", :subcommand_list

    #
    # Delegates to subcommands or prints help if no subcommand specified.
    #
    def execute
      subcmd_name = @match[1]
      return puts(help) unless subcmd_name

      subcmd = subcommand_list.match(subcmd_name)
      raise CommandNotFound.new(subcmd_name, self.class) unless subcmd

      subcmd.new(processor, arguments).execute
    end

    #
    # Class methods added to subcommands
    #
    module ClassMethods
      include Helpers::ReflectionHelper

      #
      # Default help text for a command with subcommands
      #
      def help
        super + subcommand_list.to_s
      end

      #

View on GitHub (pinned to 25476b18d9)

Solutions

1. Check the subcommand name for typos; run '<cmd>' alone to list its valid subcommands.
2. Use the exact subcommand name as registered in the command's subcommand list.

Example fix

(byebug) info breakpoints   # instead of an invalid subcommand like 'info bp'

When it happens

Trigger: Thrown at lib/byebug/subcommands.rb:28 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deivid-rodriguez/byebug@25476b18d9 (2026-08-23). Data as JSON: /api/errors/8a94de5d987d878f. Report an issue: GitHub.