Command + fullstop VS Ctrl + C
They are exactly the same. ⌘ CMD+. sends SIGINT just like ⌃ CTRL+c. I've checked this with this python script:

#!/usr/bin/env python
import signal
import sys
def signal_handler(signal, frame):
    print('You pressed Ctrl+C!')
    sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
print('Press Ctrl+C')
signal.pause()


It's made this way for backward compatibility, earlier versions of Apple keyboards did not have ⌃ CTRL button. Please read Max Ried comment bellow.



code from: https://stackoverflow.com/a/1112350/3488699