command "cd", "Move into a new context (use `cd ..` to go back and `cd /` to return to Pry top-level)"  do |obj|
        path            = arg_string.split(/\//)
        stack           = _pry_.binding_stack.dup

        # special case when we only get a single "/", return to root
        stack = [stack.first] if path.empty?

        resolve_failure = false
        path.each do |context|
          begin
            case context
            when ""
              stack = [stack.first]
            when "."
              next
            when ".."
              if stack.one?
                _pry_.binding_stack.clear
                throw(:breakout)
              else
                stack.pop
              end
            else
              stack.push(Pry.binding_for(stack.last.eval(context)))
            end

          rescue RescuableException
            output.puts "Bad object path: #{arg_string}. Failed trying to resolve: #{context}"
            resolve_failure = true
          end
        end

        next if resolve_failure

        _pry_.binding_stack = stack
      end