Ctty command
Updated: 03/21/2025 by Computer Hope
Ctty is an MS-DOS utility that lets you change the standard computer input/output device.
Availability
Ctty is an internal command and is available for 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.