/usr/bin/ldiff

Usage: ldiff [options] oldfile newfile

    -c, -C, --context [LINES]        Displays a context diff with LINES lines
                                     of context. Default 3 lines.
    -u, -U, --unified [LINES]        Displays a unified diff with LINES lines
                                     of context. Default 3 lines.
    -a, --text                       Treat the files as text and compare them
                                     line-by-line, even if they do not seem
                                     to be text.
        --binary                     Treats the files as binary.
    -q, --brief                      Report only whether or not the files
                                     differ, not the details.
        --help                       Shows this text.
        --version                    Shows the version of Diff::LCS.

By default, runs produces an "old-style" diff, with output like UNIX diff.