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Scala code to find (and move or remove) duplicate files

My MacBook recently told me I was running out of disk space. I knew that the way I was backing up my iPhone was resulting in me having multiple copies of photos and videos, so I finally decided to fix that problem by getting rid of all of the duplicate copies of those files.

So I wrote a little Scala program to find all the duplicates and move them to another location, where I could check them before deleting them. The short story is that I started with over 28,000 photos and videos, and the code shown below helped me find nearly 5,000 duplicate photos and videos under my ~/Pictures directory that were taking up over 18GB of storage space. (Put another way, deleting those files saved me 18GB of storage.)

How to copy a file in Java

The easiest way to copy a file in Java is to download the Apache Commons IO library; just download their library, then use the methods of their FileUtils class to copy a file.

However, if you're just as interested in the technical details of how to copy a file in Java, or just want a method to copy a file in Java, the method below, taken from my Java file utilities class, shows how this actually works: