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An administrator can use SAC to access a command prompt, shutdown or reboot the machine, collect a crash dump, or view system information such as the hostname, OS version, running processes, or an IP address or addresses. SAC provides a form of multitasking via channels. Channels can be opened by software running on the system.
This recovery prompt is also displayed when the primary command processor is aborted due to faults or if it is exited deliberately. [4] (In the case of COMMAND.COM, the internal EXIT command is disabled only when the shell was started with /P.) This also provides limited means to replace the shell at runtime without having to reboot the system.
It can also install a standard master boot record on the hard drive. The command is available in MS-DOS versions 3.2 and later and IBM PC DOS 2.0 releases and later ...
SYS will also copy the command line shell (COMMAND.COM) into the root directory. [6] The command can be applied to hard drives and floppy disks to repair or create a boot sector. Although an article on Microsoft's website says the SYS command was introduced in MS-DOS version 2.0, [7] this is incorrect.
It contains the system initialization code and all built-in device drivers. It also loads the DOS kernel and optional pre-loadable system components (like for disk compression or security), [1] [2] displays boot menus, processes configuration files (like CONFIG.SYS) and launches the shell (like COMMAND.COM).
BIOS interrupt calls perform hardware control or I/O functions requested by a program, return system information to the program, or do both. A key element of the purpose of BIOS calls is abstraction - the BIOS calls perform generally defined functions, and the specific details of how those functions are executed on the particular hardware of the system are encapsulated in the BIOS and hidden ...
The command is used to configure, query, or change Boot.ini file settings. [2] A similar command exists in the Recovery Console for repairing or rebuilding boot configuration files. [1] [3] Though NTLDR and boot.ini are no longer used to boot Windows Vista and later versions of
Command Prompt, also known as cmd.exe or cmd, is the default command-line interpreter for the OS/2, [1] eComStation, ArcaOS, Microsoft Windows (Windows NT family and Windows CE family), and ReactOS [2] operating systems. On Windows CE .NET 4.2, [3] Windows CE 5.0 [4] and Windows Embedded CE 6.0 [5] it is referred to as the Command Processor ...