IEBDG) create a file of test data according to specified patterns. Hex editors directly modify the text or data of a file without regard to file format. These files can be data or programs. HTML checkers validate HTML code and check links. Installation or setup utilities are used to initialize or configure programs, usually applications programs, for use in a specific computer environment. There are also Uninstallers. Patching utilities perform alterations of files, especially object programs when program source is unavailable. Screensavers prevent phosphor burn-in on CRT and plasma computer monitors. Sort/Merge programs arrange records (lines) of a file into a specified sequence. Standalone macro recorders permit use of keyboard macros in programs that do not natively support such a feature. See also List of DOS commands List of macOS built-in apps Support programs for OS/360 and successors List of Unix commands List of KDE utilities Batch file Shell script References