cec-client

List all CEC adapters

$ cec-client -l

$ sudo cec-client

$ sudo cec-client -o [name]

$ echo [on 0] | sudo cec-client -s

$ standby [0]

$ on [0]

cec-client [options]

cec-client manages CEC (Consumer Electronics Control) connections over HDMI using the libCEC library. CEC is a feature of the HDMI specification that allows devices connected via HDMI to control each other, enabling actions like turning on a TV when a media player starts, or controlling volume across devices with a single remote.
The tool provides both interactive and scripted control of CEC-enabled devices. In interactive mode, you can send commands like `on`, `standby`, and `tx` (raw CEC frames) to any device on the HDMI bus. For automation, the `-s` flag processes a single command from stdin and exits, making it suitable for use in scripts and home automation setups.
Devices are addressed by logical address (0-15), where 0 is typically the TV, 1 is a recording device, and 5 is an audio system.

-l, --list-devices

List available CEC adapters

Set the On-Screen Display name

Execute a single command from stdin and exit

Use specific CEC device

on address

Turn on device at address

Put device into standby

Transmit raw CEC frame

Scan the CEC bus for devices

Requires a USB CEC adapter (like Pulse-Eight). Device addresses are 0-15 where 0 is typically the TV. Root privileges required for device access.

cec-ctl(1)