shell script run in backend

["Tom Reed" <tom@dkinbox.com>]

Hello list

I have a long run shell script with similar content,

#!/bin/bash

while [ 1 ];do
  func1()
  func2()
  sleep 5
done


Currently the script is running in front-end in shell.
How can I run it with the backend way? can I register it as a system service?

Thanks