From owner-freebsd-questions@FreeBSD.ORG  Wed Jun 20 10:19:38 2012
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Date: Wed, 20 Jun 2012 05:19:51 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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In-Reply-To: <alpine.BSF.2.00.1206201049450.23394@wojtek.tensor.gdynia.pl>
Subject: Re: seems i cannot fully understand {/,/usr/local/}/etc/rc.d/*
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> From owner-freebsd-questions@freebsd.org  Wed Jun 20 03:51:43 2012
> Date: Wed, 20 Jun 2012 10:51:04 +0200 (CEST)
> From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
> To: Matthew Seaman <matthew@freebsd.org>
> Cc: freebsd-questions@freebsd.org
> Subject: Re: seems i cannot fully understand {/,/usr/local/}/etc/rc.d/*
>
> >
> > 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?

An explanation written some 80 years ago; 
  'Because that way it will work'.