[adrianratnapala]

> Unison https://www.cis.upenn.edu/~bcpierce/unison/ is a tool to keep two folder structures in sync - that is its main goal but it can have other uses.

And though I tend to be a GUI hater, Unison is one tool where I find the GUI much more useful than the command line alone. The game is to iteratively come up with a set of rules which Unison will use to into effect on your dataset. The GUI quickly show you the effect of your current rules, and lets you propose the next iteration etc.