DateThe date command is used to show or change the current date.
The debug command starts Debug, a command line application used to test and edit programs.
The debug command is not available in 64-bit versions of Windows 8.
DefragThe defrag command is used to defragment a drive you specify. The defrag command is the command line version of Microsoft's Disk Defragmenter.
DelThe del command is used to delete one or more files. The del command is the same as the erase command.
DirThe dir command is used to display a list of files and folders contained inside the folder that you are currently working in. The dir command also displays other important information like the hard drive's serial number, the total number of files listed, their combined size, the total amount of free space left on the drive, and more.
DiskcompThe diskcomp command is used to compare the contents of two floppy disks.
DiskcopyThe diskcopy command is used to copy the entire contents of one floppy disk to another.
DiskpartThe diskpart command is used to create, manage, and delete hard drive partitions.
The diskperf command is used to manage disk performance counters remotely.
The diskperf command was useful for disk performance counter administration in Windows NT and 2000 but are permanently enabled in Windows 8.