Programmers have used diff utilities for years. In brief: A diff utility lets you input two files, then the program calculates exactly where the files contain changes. Diffing is the basis of such ...

An interesting question came up on a list we subscribe to: How can you compare two versions of a Web page to see what changes have been made? This question was raised by someone acting as an expert ...

You often may need to compare one version of a file to an earlier one or check one file against a reference file. Linux provides several tools for doing this ...