class Gem::Commands::InstallCommand

def initialize
  defaults = Gem::DependencyInstaller::DEFAULT_OPTIONS.merge({
    format_executable: false,
    lock: true,
    suggest_alternate: true,
    version: Gem::Requirement.default,
    without_groups: [],
  })
  defaults.merge!(install_update_options)
  super "install", "Install a gem into the local repository", defaults
  add_install_update_options
  add_local_remote_options
  add_platform_option
  add_version_option
  add_prerelease_option "to be installed. (Only for listed gems)"
  @installed_specs = []
end