Today I managed to successfully flash my uzebox for the first time using avrdude so I thought I would rewrite and nicely format the instructions that Artcfox wrote on the forum for using avrdude under Linux and get it added to the wiki on the avrdude page:
https://uzebox.org/wiki/Avrdude
I also added a link to that page on the AVR Programming page:
https://uzebox.org/wiki/AVR_Programming
I'm not sure that the Windows instructions on that page are still valid but I know the Linux instructions work.