The devicehigh command is used in the CONFIG.SYS file to load device drivers into upper memory. The device command is used in the CONFIG.SYS file to load device drivers into memory. The deltree command is used to delete a directory and all the files and subdirectories within it. The del command is the same as the erase command. The del command is used to delete one or more files. The defrag command is the command line version of Microsoft's Disk Defragmenter. The defrag command is used to defragment a drive you specify.

The debug command starts Debug, a command line application used to test and edit programs.

The dblspace command is used to create or configure DoubleSpace compressed drives. The date command is used to show or change the current date. The ctty command is used to change the default input and output devices for the system. The country command is used in the CONFIG.SYS file to tell MS-DOS to use country-specific text conventions during processing. The copy command copies one or more files from one location to another. The command command starts a new instance of the command interpreter. The cls command clears the screen of all previously entered commands and other text. The choice command is used within a script or batch program to provide a list of choices and return the value of that choice to the program. The chkdsk command, often referred to as check disk, is used to identify and correct certain hard drive errors. Chdir can also be used to change the drive and/or directory that you want to work in. The chdir command is used to display the drive letter and folder that you are currently in. The chcp command displays or configures the active code page number. The cd command is the shorthand version of the chdir command. In other words, running the call command at the MS-DOS prompt will do nothing. The call command has no effect outside of a script or batch file. The call command is used to run a script or batch program from within another script or batch program. The break command sets or clears extended CTRL+C checking on DOS systems.

The attrib command is used to change the attributes of a single file or a directory. This command can also show drive assignments and reset drive letters to their original assignments. The assign command is used to redirect drive requests to a different drive. The append command can be used by programs to open files in another directory as if they were located in the current directory.

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