I really thought I was computer / software savy but I can not figure out how to flash the OS2008 beta update in my new N800

I really don't understand the following instructions

PC: Execute as root (or as a normal user with rights to use the USB port):
./flasher-3.0 -F RX-34_2007SE_4.2007.38-2_PR_COMBINED_MR0_ARM.bin -f -R


I will really appreciate help with this.

Thanks,
Jack