Patch Manager and Difference Viewer Xfdiff is graphic interface to the GNU diff and patch commands. With this utility, you can view differences side by side for files or directories. You can also view differences that applying a patch file would imply, without applying the patch. You can also apply patches to the hard disc or create patch files for differences between files or directories. All-in-all, a handy utility for lazy chaps who don't want to type the "diff" command.