avrdude -p m328p -P com3 -c avrisp -b 19200 -U eeprom:r:"GLB_eeprom.hex":i
...Obviously change com3 to whatever com port your Uno-as-ISP is connected to.
Of course this is just a raw hex dump. It would be easier, if you have serial comms to the target device, to include an option in the main program that will export the EEPROM. For all of my projects that have the ability to edit their own EEPROM, I always include a menu option that prints out the values of everything that I've stored in the EEPROM.