Microsoft DOS ctty command

Updated: 05/21/2018 by Computer Hope

About ctty

Ctty is an MS-DOS utility that allows you to change the standard computer input/output device.

Availability

The ctty command is an internal command and is available in the following Microsoft operating systems.

Ctty syntax

Changes the terminal device used to control your system.

CTTY device

device The terminal device you want to use, such as COM1.

Available MS-DOS devices for CTTY:

AUX
COM1
COM2
COM3
COM4
CON
LPT1
LPT2
LPT3
NUL

Ctty examples

ctty aux

Moves the input and output to a remote terminal connected to the auxiliary port.

ctty con

Moves the input and output back to the main terminal. This command would be typed from a remote terminal.

Warning: Using CTTY NUL will disconnect the computer display and keyboard from the screen and not allow you to reconnect the input and output from a remote terminal.

Additional information