Use AVRDUDESS to Read Flash

IMPORTANT:
copy some hex file and paste in an accessable folder rename it to flash.hex now do as show in folder
Command:
avrdude -c arduino -p m328p -P COM4 -b 57600 -U flash:r:"D:\flash.hex":i
avrdude.exe: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.01s
avrdude.exe: Device signature = 0x1e950f (probably m328p)
avrdude.exe: reading flash memory:
Reading | ################################################## | 100% 7.79s
avrdude.exe: writing output file "D:\flash.hex"
avrdude.exe done. Thank you.