seems i cannot fully understand {/,/usr/local/}/etc/rc.d/*

[Wojciech Puchar]

>
> Create a new file in /usr/local/etc/rc.d/precedence with the following
> contents:
>
> #!/bin/sh
> #
> # Persuade vboxheadless to start before samba.
>
> # PROVIDE: precedence
> # REQUIRE: vboxheadless
> # BEFORE: samba
>
> :
>
> Make it executable.  Note -- the ':' does seem to be necessary.
>
thank you for help. I will test it when being on place and could 
reboot.

But still - do you know why it is necessary?

cannot i just add BEFORE: samba in vboxheadless?