When working with the built in terminal in IntelliJ IDEA 2016.2.3 on OSX El Capitan the process exiting command (control-c) doesn't work. It only writes c
in the console and nothing happens.
According to your settings it should be Meta + C. Normally it is the same key combination used to 'copy' purpose.
Anyway you can check and use as follows,
You can also change the keymap you are using from the 'keymap' drop down menu appearing here, and switch to a different one, if you are not comfortable with your settings. 'Mac OS X 10.5 + would be a good one for you.