Writing basic systemd service files

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Step 1: I created this file (note location) which essentially fires a bash process with an extended argument. You could fire your own command which could be different from bash.
[root@y500-fedora ~]# cat /etc/systemd/system/foo.service 
[Unit]
Description=foo

[Service]
ExecStart=/bin/bash -c "while true; do /bin/inotifywait -qq --event close_write /sys/class/backlight/acpi_video0/brightness; su myusername -c '/bin/xbacklight -display :0 -set $(cat /sys/class/backlight/acpi_video0/brightness)'; done"

[Install]
WantedBy=multi-user.target
Step 2:
Reload systemd:
systemctl daemon-reload
Start the new service:
systemctl enable foo
(similarly you can disable it)
(optional) Step 3: It should start automatically at next reboot into multi-user mode (run level 3) but if you want to start it right away:
systemctl start foo
systemctl status foo # optional, just to verify

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