How to count differences between two files on linux?

Question

I need to work with large files and must find differences between two. And I don\'t need the different bits, but the number of differences.

To find the number of dif

Answer 1

If using Linux/Unix, what about comm -1 file1 file2 to print lines in file1 that aren't in file2, comm -1 file1 file2 | wc -l to count them, and similarly for comm -2 ...?