Run a script at shutdown on Raspbian

Question

I'm trying to run a script right before my Pi shuts down. OS: Raspbian Stretch

Here is what I did so fare:

1. put my script (name: sendir) in /etc/init.d/
2. created a symbolic link to it in /etc/rc6.d with the name K99sendir

The script is executable and if I run it inside /etc/rc6.d via ./K99sendir it works but it does not work when I actually shutdown the system.

This is what the script looks like:

#!/bin/bash

irsend SEND_ONCE ph_remote KEY_POWER

Does anybody have an idea what's missing?

Answer 1

If you are using systemd, just put your script to /lib/systemd/system-shutdown/ as described here and here.

EDIT: If it's not working try this one:

Create a systemd service: /etc/systemd/system/yourSript.service with following lines:

[Unit]
Description=yourScript

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/bin/true
ExecStop=/usr/local/bin/yourScript

[Install]
WantedBy=multi-user.target

Move your Script to /usr/local/bin/yourScript.

And enable the service

sudo systemctl daemon-reload

sudo systemctl enable yourScript.service --now.

Answer 2

The reason why your script isn't working is that apparently, starting with Jessie, Debian breaks compatibility with System V scripts. They still seem to work correctly on startup (their most important use case), but no longer do on shutdown.

You'll have to get used to systemd.