avrdude -F -v -v -v -v -pm168 -cstk500v1 -P/dev/ttyUSB0 -b19200 -D -Uflash:r:program.bin:r
will write the data from the ATmega168 to program.bin on a Linux system using /dev/ttyUSB0 as the USB port at 19200bps
This was tested and seems to work
avrdude -F -v -v -v -v -pm168 -cstk500v1 -P/dev/ttyUSB0 -b19200 -D -Uflash:r:program.bin:r
will write the data from the ATmega168 to program.bin on a Linux system using /dev/ttyUSB0 as the USB port at 19200bps
This was tested and seems to work