Disk Operation System (DOS) is an operating system developed for IBM compatible computers in 1981 and was last updated in 1994. MS-DOS 6.22. This operating system in not widely used today and exist in older computers. The top ten basic DOS commands are: cd, dir, copy, del, edit, move, ren (rename), deltree, cls, and format. These commands are basically used for file and directory management.
. Learn more: http://www.computerhope.com/dostop10.htm.