Buster Startup Scripts

A systemd service can be created to start up various applications. Create the file /etc/systemd/system/yourapp.service with the contents:

[Unit]
Description=Run an application on startup
# Uncomment the following line if networking is a dependency of the application being run
# After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/your_app_or_script

[Install]
WantedBy=multi-user.target

The service can be started immediately and enableed on future boots with the following:

# Start the app on startup, but will not start it now
systemctl enable yourapp.service

# Start the app now, but doesn't change auto startup
systemctl start yourapp.service

See the systemd documentation for more information on how systemd services can be set up and configured.