How to add a custom command when shutting down the Pi?

[Cr4z33]

I need to add a command line ONLY IF shutting down (NOT when rebooting) the Pi.

Can someone please tell me how to do that?

[davidcoton]

https://www.raspberrypi.org/forums/view ... 1&t=233172

[Cr4z33]

Thanks for the link, but I am still quite confused on what is the best solution for me.

Basically all I want is to run

Code: Select all

echo standby 0 | cec-client -s -d 1

right after I click the LXDE shutdown button.

First of all does it have to look like the following?

Code: Select all

[Unit]
Description=Run CEC command to turn the TV off
DefaultDependencies=no
Before=umount.target

[Service]
Type=oneshot
ExecStart=echo standby 0 | cec-client -s -d 1

[Install]
WantedBy=poweroff.target halt.target

I saved it as /lib/systemd/system/cec-shutdown.service

Rebooted and then shutdown the Pi, but the TV keeps staying on...