Dell PowerEdge M420 Reference Manual page 166

Short Form Commands
The CLI supports the short forms of all commands. As long as it is possible to
recognize the entered command unambiguously, the CLI accepts the short
form of the command as if the user typed the full command.
Keyboard Shortcuts
The CLI has a range of keyboard shortcuts to assist in editing the CLI
commands. The help command, when used in the User EXEC and Privileged
EXEC modes, displays the keyboard short cuts.
Table 2-2 contains the CLI shortcuts displayed by the help command.
166
Using the CLI