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Choice was introduced as an external command with MS-DOS 6.0; [1] [2] Novell DOS 7 [3] and PC DOS 7.0. Earlier versions of DR-DOS supported this function with the built-in switch command (for numeric choices) or by beginning a command with a question mark. [3] This command was formerly called ync (yes-no-cancel).
In MS-DOS, a batch file can be started from the command-line interface by typing its name, followed by any required parameters and pressing the ↵ Enter key. When DOS loads, the file AUTOEXEC.BAT, when present, is automatically executed, so any commands that need to be run to set up the DOS environment may be placed in this file.
COMMAND.COM is the default command-line interpreter for MS-DOS, Windows 95, Windows 98 and Windows Me.In the case of DOS, it is the default user interface as well. [2] It has an additional role as the usual first program run after boot (init process), hence being responsible for setting up the system by running the AUTOEXEC.BAT configuration file, and being the ancestor of all processes.
The command was first introduced as an external command (with filenames CHOICE.COM or CHOICE.EXE) with MS-DOS 6.0. [2] It is included in Novell DOS 7 and IBM PC DOS 7.0, and is also available from the command-line shell of some versions of Microsoft Windows, but not under Windows 2000 and Windows XP. [3]
The command-syntax on CP/M is: TYPE ufn Note: ufn = unambiguous file reference In MP/M, the command has a pause mode. It is specified by entering a 'P' followed by two decimal digits after the filename. The specified number of lines will be displayed and then the command will pause until a carriage return is entered. [7]
The category DOS commands deals with articles related to internal and external commands supported by members of the family of DOS compatible operating systems for IBM PC compatible computers, such as MS-DOS, PC DOS, DR DOS, Concurrent DOS, Multiuser DOS, REAL/32, FlexOS, Novell DOS, PalmDOS, OpenDOS, FreeDOS, RxDOS, ROM-DOS, Embedded DOS, etc.
On MS-DOS, it is available in versions 2 and later. [5] DR DOS 6.0 also includes an implementation of the cd and chdir commands. [6] The command is also available in the open source MS-DOS emulator DOSBox and in the EFI shell. [7] It is named chdir in HP MPE/iX. [8] The command is analogous to the Stratus OpenVOS change_current_dir command. [9]
The line-oriented debugger DEBUG.EXE is an external command in operating systems such as DOS, OS/2 and Windows (only in 16-bit/32-bit versions [1]).. DEBUG can act as an assembler, disassembler, or hex dump program allowing users to interactively examine memory contents (in assembly language, hexadecimal or ASCII), make changes, and selectively execute COM, EXE and other file types.