arduino avrdude upload hex file by command

Arduino Uno

avrdude -c arduino -P com4 -b 115200 -p ATMEGA328p -U flash:w:camBox.ino.hex
or
avrdude -c arduino -P com4 -b 115200 -p m328p -U flash:w:camBox.ino.hex
or
avrdude -c arduino -P com4 -b 115200 -p ATMEGA328p -U flash:w:E:\camBox.ino.hex:i


Arduino Mega

avrdude -c wiring -P com4 -b 115200 -p m2560 -U flash:w:camBox.ino.hex

avrdude -c wiring -P com4 -b 115200 -p ATmega2560 -U flash:w:E:\camBox.ino.hex:i


partno list
http://www.nongnu.org/avrdude/user-manual/avrdude_4.html

or see the avrdude.conf