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.
DoskeyThe doskey command is used to edit command lines, create macros, and recall previously entered commands.
The dosshell command starts DOS Shell, a graphical file management tool for MS-DOS.
The dosshell command was only available up to MS-DOS 6.0 but most MS-DOS 6.22 installations were upgrades from previous versions so the dosshell command is usually still available.
The drvspace command is used to create or configure DriveSpace drives.
DriveSpace is an updated version of DoubleSpace, executed using the dblspace command.
EchoThe echo command is used to show messages, most commonly from within script or batch files. The echo command can also be used to turn the echoing feature on or off.
The edit command starts MS-DOS Editor, a tool used to create and modify text files.
The edlin command starts the Edlin tool which is used to create and modify text files from the command line.
Edlin was only available up to MS-DOS 5.0 so unless your version of MS-DOS 6.22 was upgraded from 5.0, you likely won't see the edlin command. Later versions of Windows again included the edlin command.
Emm386The emm386 command is used to give MS-DOS access to more than 640 KB of memory.
The erase command is used to delete one or more files.
The erase command is the same as the del command.