Flash ATMegaX/ATTinyX with the Yuns internal ATMega32u4. How?

Dear Arduino Forum,

I am trying to flash an ATTiny45 with my Yun. I wired everything up correctly. Flashing it via the Arduino IDE and avrdude works fine. (My computer is running Linux)

I used follwing command to flash the ATTiny via USB from the Terminal:

avrdude -P /dev/ttyACM0 -c avrisp -p t45 -F -U #hexfile.hex

But now I would like to flash the ATTiny45 from the Linino Processor. This should make it unnecessary for me to have the Arduino linked up to my computer via USB.
I used SSH to access my Yuns file system. I opened up the /dev directory and found following entry:
TTYATH0.
I'm assuming that this is the Yuns Atmel ATMega32u4 microchip. Then I tried to run the command again. But now I replaced "/dev/ttyACM0" with "/dev/ttyATH0". I receive following error message:

avrdude: stk500_recv(): programmer is not responding

What have I done wrong?? :frowning:

Thank you for any advice you could give me. Sorry about my spelling. I'm from Germany