Today I discovered opendiff tool that’s native to OS X – provided you have installed the Xcode on your system. It allows you to compare 2 directories and perform actions such as merge-left, merge-right etc…
Opendiff simply launches FileMerge OS X utility, which is another one I didn’t know about, and displays differences between 2 selected directories.
The very simple command to compare 2 directories is:
opendiff dir1 dir2
This will then launch FileMerge utility and give you a nice visual representation of differences in your folders: