Tools -> Create Command-line Launcher 를 실행해서 /usr/local/bin/idea 를 생성합니다. $ idea diff file1 file2 형식으로 사용합니다.

This is getting out of hand, how can JetBrains ignore for months critical bug which prevents a customer from upgrading a product he is paying for? Why I have to always nag at social networks before anything