run

# File lib/bundler/cli/exec.rb, line 23
    def run
      validate_cmd!
      SharedHelpers.set_bundle_environment
      if bin_path = Bundler.which(cmd)
        if !Bundler.settings[:disable_exec_load] && ruby_shebang?(bin_path)
          return kernel_load(bin_path, *args)
        end
        # First, try to exec directly to something in PATH
        if Bundler.current_ruby.jruby_18?
          kernel_exec(bin_path, *args)
        else
          kernel_exec([bin_path, cmd], *args)
        end
      else
        # exec using the given command
        kernel_exec(cmd, *args)
      end
    end