Running a script on reboot using systemd (instead of cron)

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0. (Optional) Study the example service definitions in /usr/lib/systemd/system.

1. Create a new service file in /etc/systemd/system with a ".service" extension. Here's an example that will run a bash script at boot time:

[Unit]
Description=A Simple Script

[Install]
WantedBy=multi-user.target

[Service]
ExecStart=/bin/bash /path/to/script.sh
Type=simple
User=josh
Group=josh
WorkingDirectory=/home/josh
Restart=on-failure

2. Start the service once.

sudo systemctl daemon-reload
sudo systemctl start <whatever>.service

3. If the above worked, then set it to run every time the computer restarts.

sudo systemctl enable <whatever>.service

NOTE: According to the docs: "...shell command lines are not directly supported. If shell command lines are to be used, they need to be passed explicitly to a shell implementation of some kind. Example:"

ExecStart=sh -c 'dmesg | tac'"