### About the Command Line Interface

Use the following topics to learn more about the device/terminal server command line interface.

#### Navigation and Editing Keys

Use the following keys to navigate along the command line and edit device/terminal server commands. Use the set keys command to define different keys for these functions.

Key | Action
CTRL-B | Moves the cursor back one space
CTRL-F | Moves the cursor forward one space
CTRL-H (Backspace) | Deletes the character to the left of the cursor
DELETE | Deletes the character under the cursor
CTRL-P | Scrolls back through commands
CTRL-N | Scrolls forward through commands
ENTER | Executes the command typed on the command line

#### Online Help

Online help is available for device/terminal server commands. The following describes how to access help:

For information on... | Enter
All commands | `?` or `help` (with no additional parameters) Note: Both forms are permissible on all device/terminal servers, but their behavior is different. On all device/terminal servers, ? displays a list of commands. On PortServer TS 8/16, help also displays the command list, but on Digi One RealPort and PortServer TS 2/4, help provides a more verbose description of the command line interface.
A specific command | The command and then ? Example: `info ?`

#### Abbreviating Commands

All device/terminal server commands can be abbreviated. You need only supply a sufficient number of command letters to uniquely identify the command.