GNU Diffutils (diff) Review

Great for creating patch files, using with other *nix utilities (for example, colordiff). Does not require a GUI.

These patches can be used to apply the differences to the same source file at a different storage location (different folder, different machine).

The difference can be output in formats known as normal, unified, ed, rcs, and side-by-side.

Two directory trees can be compared file by file recursively. All differences are output concisely.