How to find common strings among two very large files?

Question

I have two very large files (and neither of them would fit in memory). Each file has one string (which doesn\'t have spaces in

Answer 1

You haven't said what platform you're working on, so I assume you're working on Windows, but in the unlikely event that you're on a Unix platform, standard tools will do it for you.

sort file1 | uniq > output
sort file2 | uniq >> output
sort file3 | uniq >> output
...
sort output | uniq -d