I'm trying to program my brand new uno from the command line without much success in Windows 8. The arduino IDE programming works fine.
The command I have tried (and many variations thereof) is:
avrdude -p atmega328p -P \\.\com5 -carduino -b 57600 -D -U flash:w:main.hex
It's definately com5. I've also tried 19200 baud and other target programmers and processors as I find in google searches but they all do the same thing which is cause the L LED to blink a few times, the Rx light blinks a couple of times and then it goes back to running the old sketch that was already programmed into it (blinky).
The error I get from avrdude each time is
avrdude: stk500_getsync(): not in sync: resp=0x00
Anyone know how to do this? I've been googling and experimenting for a couple of hours now and don't feel like I'm getting any closer.