You can use your Uno as an "Arduino as ISP" ISP programmer and use that in conjunction with AVRDUDE to upload .hex files to your ATtiny13A. You won't be able to use the Arduino IDE for uploading the .hex file to your ATtiny13A but you can use it to upload the ArduinoISP sketch to your Uno and you can use the version of AVRDUDE that's included with the Arduino IDE.