--On Wednesday, December 12, 2018 7:04 PM -0500 Robert Moskowitz rgm@htt-consult.com wrote:
So can someone point me to how to make this into a simple systemd service?
I'd first create a utility script (untried code!) like this:
/usr/local/sbin/BlueLedFunction.sh
#!/bin/sh echo "$1" > /sys/class/leds/blue:heartbeat/trigger
Then I'd create /etc/systemd/system/BlueLedOff.service with appropriate sections to invoke that script with "none" as an argument and to run in your desired runlevel. (Take a look at the examples in /lib/systemd/system.) Then issue this to have it run at startup:
systemctl enable BlueLedOff
Note that custom unit files go in /etc/systemd/system to avoid having them overwritten by distro updates. You can customize existing unit files by either copying them from /lib/systemd to /etc/systemd or you can override single settings with specially-named subdirectories in /etc/systemd/system. See the unit file documentation for details.