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For example, in DOS 5, if the current directory is C:\TEMP, then TRUENAME command.com will display C:\TEMP\COMMAND.COM (which does not exist), not C:\DOS\COMMAND.COM (which does and is in the PATH). This command displays the UNC pathnames of mapped network or local CD drives. This command is an undocumented DOS command.
Changes made to the command line environment after SetLocal commands are local to the batch file. EndLocal command restores the previous settings. [17] The Call command allows subroutines within batch file. The Call command in COMMAND.COM only supports calling external batch files. File name parser extensions to the Set command are comparable ...
CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems.It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot.
For example, to print a white character with a black background, a color attribute of 0F hex would be used. The high four bits are set to 0000 bin, representing the background color, black. The low 4 bits, 1111 bin, represent the foreground color, white. The highest bit of the color attribute, which is also the highest bit of the background ...
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 performs the following actions by default on a floppy disk, hard disk drive, solid state , or other magnetic medium (it will not perform these actions on optical media): clearing the FAT entries by changing them to 0x00; clearing the FAT root directory by changing any values found to 0x00 [nb 1] [1] [2] [3]
The command was introduced in MS-DOS/IBM PC DOS 2.0. [17] [18] DR DOS 6.0 includes an implementation of the PRINT command. [19] In early versions of DOS, printing was accomplished using the copy command: the file to be printed was "copied" to the file representing the print device. [20] Control returned to the user when the print job completed ...
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.