A disk operating system (DOS) is an operating system that runs from a hard disk drive.
Disk operating systems are operated by command-line interface in which the user can issue commands to the programme through lines of text.
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There are several types of DOS based on different companies and manufacturers including MS-DOS, DR-DOS, PC DOS, ROM DOS and PTS-DOS. All have similar command-line systems. MS-DOS, an acronym for Microsoft disk operating system, was used widely on IBM personal computers throughout the 1980s and 1990s for example.
