[xubuntu] How to add startup script to read-only /root system

Hi Everyone,

I have created read-only /root system in my Xubuntu system. Now root is read-only. Now If I want to add startup script to this system how I can add. Now /root path is /mnt/root-ro, not the default "/" path.

Can some one please help me how to do this?

Thanks,
Namratha.